Navman FUEL 3100 User manual

NAVMAN
Installation and
Operation Manual
www.navman.com
FUEL 3100

3
FUEL 3100 Installation and Operation Manual NAVMAN
FCC Statement
Note: This equipment has been tested and found to comply with the limits for a Class B
digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to
provide reasonable protection against harmful interference in a normal installation. This
equipment generates, uses and can radiate radio frequency energy and, if not installed
and used in accordance with the instructions, may cause harmful interference to radio
communications. However, there is no guarantee that interference will not occur in a
particular installation. If this equipment does cause harmful interference to radio or
television reception, which can be determined by turning the equipment off and on, the
user is encouraged to try to correct the interference by one or more of the following
measures:
Reorient or relocate the receiving antenna.
Increase the separation between the equipment and receiver.
Connect the equipment into an output on a circuit different from that to which the
receiver is connected.
Consult the dealer or an experienced technician for help.
A shielded cable must be used when connecting a peripheral to the serial ports.
Important
It is the owner’s sole responsibility to install and use the instrument and transducer(s) in a manner that will
not cause accidents, personal injury or property damage. The user of this product is solely responsible for
observing safe boating practices.
The NAVMAN fuel flow transducers have been specifically developed for use in marine applications with
gasoline inboard and outboard engines and are not warranted for any other type of application. NAVMAN
fuel flow transducers must NOT be used with diesel engines.
Warning
This fuel flow transducer will create additional back pressure in a fuel system of 1/2" of mercury at 19.8 US
gallons/hour(75litres/hour)consumption and1"ofmercurywitha39.5US gallonsperhour(150 litres/hour)
consumption. It is the owners responsibility to ensure that fitting of this fuel flow transducer does not cause
fuel starvation which may lead to poor engine performance.
NAVMAN NZ LIMITED DISCLAIMS ALL LIABILITY FORANY USE OF THIS PRODUCT INAWAY THAT
MAYCAUSEACCIDENTS, DAMAGE OR THAT MAY VIOLATE THE LAW.
This manual represents the FUEL3100 as at the time of printing. Navman NZ Limited reserves the right to
make changes to specifications without notice.
Governing Language: This statement, any instruction manuals, user guides and other information relating
to the product (Documentation) may be translated to, or has been translated from, another language
(Translation).IntheeventofanyconflictbetweenanyTranslationoftheDocumentation,theEnglishlanguage
version of the Documentation will be the official version of the Documentation.
Copyright©2003NavmanNZLimited,NewZealand.Allrightsreserved. NAVMANisaregisteredtrademark
of Navman NZ Limited.
Warnings
1.Everyefforthasbeenmadeby themanufacturerto ensurethatthe materialsusedinthe NAVMAN fuel
flow transducer will operate reliably with different fuel mixtures. The manufacturer or its distributors can
notbeheld responsiblefor fuelformulation orany affect thismayhave onthe performanceand durability
of the fuel flow transducer.
2.NAVMANfuelflowtransducersmustNOTbeusedwithdieselengines.Refertotheseparateinstallation
instructions supplied with the fuel flow transducer for more information.

4NAVMAN FUEL 3100 Installation and Operation Manual
Contents
1 Introduction ..................................................................................................... 4
1-1How the fuel flowtransducerworks ............................................................................. 5
1-3Cleaningandmaintenance .......................................................................................... 5
2 Operation ......................................................................................................... 6
2-1 Turn on and off ............................................................................................................ 6
2-2The keys...................................................................................................................... 6
2-3TheBacklightlevel....................................................................................................... 6
2-4Low FuelAlarm ............................................................................................................ 6
2-5BatteryAlarm ...............................................................................................................6
2-6Simulationmode .......................................................................................................... 6
2-7KeyReference............................................................................................................. 7
3 The Main Display ............................................................................................. 8
3-1Fuel data ..................................................................................................................... 8
3-2Speed data ..................................................................................................................8
3-3Changing dataquickly ................................................................................................. 8
3-4Port andStarboarddataoptions................................................................................... 9
4 The Setup Menus .......................................................................................... 10
4-1Entering setupmode ................................................................................................. 10
4-2Changing asetting..................................................................................................... 10
4-3Fuelsetup (FUEL) ..................................................................................................... 10
4-4Speed setup(SPEEd) ............................................................................................... 12
4-5Backlight setup (LAmP) ............................................................................................. 14
4-6Alarmssetup(ALArm) ............................................................................................... 14
4-7Unitssetup (UnItS).................................................................................................... 14
5 Installation ..................................................................................................... 15
5-1Whatcomes with the FUEL 3100? ............................................................................ 15
5-2Tank/ EngineConfigurations ..................................................................................... 16
5-3Installingthedisplayunit............................................................................................ 16
5-4Installingthe FuelFlowTransducer ........................................................................... 17
5-5Powerand Wiring ...................................................................................................... 17
5-6Testingthe installation ............................................................................................... 18
5-7Resetting to factorydefaults ...................................................................................... 18
Appendix A - Specifications ............................................................................ 19
Appendix B - Troubleshooting ........................................................................ 20
Appendix C - How to contact us ..................................................................... 21
Units
This unit is set up with default units of US Gallons, knots and nautical miles.
Please refer to section 4-7 Units setup, to change the units.

5
FUEL 3100 Installation and Operation Manual NAVMAN
1 Introduction 1-1 How the fuel flow transducer
works
The fuel flow transducer is inserted into the fuel line
betweenthefueltankandtheengine.Asmallturbine
inside the fuel flow transducer measures the rate of
the fuel flow into the engine. This information is
relayed through the fuel flow transducer cable and
shown electronically on the display unit.
1-2 Cleaning and maintenance
Calibration of the FUEL 3100 after installation is
essential toprovidethe bestpossible performance.
Re-calibration of the FUEL 3100 is recommended
afterthefirst100 enginehoursto allowmovingparts
to ‘wear in’.
Clean the display unit and any plastic transducers
with a damp cloth or mild detergent.Avoid abrasive
cleaners, petrol or other solvents.
PuttheprotectivecoverovertheFUEL3100whenit
is not being used.
CongratulationsonchoosingaNAVMANFUEL3100.
For maximum benefit, please read this manual
carefully before installation and use.
TheFUEL3100 measuresanddisplays thefuelflow
in real time for a single or twin engine boat. It can
calculate and display the:
amount of fuel used
amount of fuel remaining
fuel flow rate
There are also Low Fuel and Battery alarms. With
twin engine boats, the FUEL 3100 allows
comparision between the flow rates of each engine
to achieve maximum synchronisation.
Iftheoptionalspeed transducerisconnected (orany
other instrument that reads speed data, such as the
SPEED 3100) the FUEL 3100 can also show the:
fuel economy
boat speed
trip log and total log
Knowing the fuel economy can help determine the
optimum throttle settings and maximise on fuel
savings.
Note that it is essential to update the fuel readings
in the FUEL 3100 after a partial or full refill, or after
manually removing fuel, to maintain accurate
electronic readouts.
The FUEL 3100 can also be customized with the
Setup menus to suit your boat and preferences.
An installed FUEL3100 usually has two parts:
the display unit.
the fuel flow transducer, which is connected to
the fuel line and wired to the display unit. (A
twin engine installation will need an extra fuel
flow transducer.)
The FUEL 3100 is powered from the boat’s main
power supply.
The FUEL 3100 is part of the NAVMAN family of
instruments for boats, which includes instruments
for speed, depth, wind, and repeaters. These
instruments can be connected together, using
NavBus,toformanintegrateddatasystemforaboat.
The FUEL 3100 can also send, share, and receive
NMEAdatafromNMEAcompliantinstruments.(See
section 5-5 Power and Wiring.)

6NAVMAN FUEL 3100 Installation and Operation Manual
2-1 Turn on and off
TurntheFUEL3100onandoffwiththeboatengine’s
ignition switch. The FUEL 3100 does not have its
ownpowerswitch.Whenitisturnedoff, anychanges
made to the settings are retained.
If SIM flashesat thebottom leftcornerofthe display,
the FUEL 3100 is in simulation mode (see section
2-6 Simulation mode).
2-2 The keys
The FUEL 3100 has four keys, labelled ESC, ENT,
and . In this manual:
Press means push the key for less than one
second.
Hold means hold the key down for two
seconds or more.
2-3 The Backlight level
Thereare five different backlight levels.See section
4-5 Backlight setup, for more information.
2-4 Fuel alarm
The FUEL 3100 can be set to sound an alarm when
thelevelon thefuel tankis belowthe setalarm level.
(see section 4-6 Low Fuel Alarm setup).
Whenthealarmsounds, theinternalbeepersounds,
the symbol,therelevantfuel gaugeonthe display
bothflashandanyexternalbeepersorlightsoperate.
Press ESC to mute the alarm.
2 Operation 2-5 Battery alarm
The FUEL 3100 can be set to sound an alarm when
the battery voltage is below the set alarm level. (see
section 4-6 BatteryAlarm setup).
Whenthealarmsounds, theinternalbeepersounds,
the symbol flashes and any external beepers or
lights operate.
Press ESC to mute the alarm.
2-6 Simulation mode
Simulation mode allows the user to become familiar
withtheFUEL3100offthewater.InSimulationmode,
theFUEL3100generatesdata internallyandignores
input from thetransducers. Theword SIM flashesat
the bottom left corner of the display.
To turn Simulation mode on or off:
1 Turn the power off.
2 Hold ESC while turning the power on.

7
FUEL 3100 Installation and Operation Manual NAVMAN
2-7 Key Reference
Special Modes
Power On + hold ESC Turn Simulation mode
On or OFF
Power On + hold ENT + Reset factory defaults
Main Display
Setup Menus
ENT + ESC for setup mode
Backlight Alarm Units
SpeedFuel
press for fuel
display options
press for speed
display options
LOG
TOTAL LOG
hours
RANGE
SPEED
press ENT once or
more for these
display options:
press ENT once
or more for these
display options:
PORT
STBD
TOTAL
PORT and STBD
PORT
STBD
TOTAL
Fortwinengineswithtwin tanks
For twin engines
REMAINING
USED
FLOW
ECONOMY
press
+
to fill tank
press
+ ENT
to reset
USED
FUEL (0.0 to 9999)
dUAL (OFF, ON)
SIZE (0 to 9999)
motor (1, 2)
CAL.F (0or 9999)
dAmP.F (1to 5)
CAL.L (0.0 to 9999)
InPUt (nO,GPS,
BUS,SEn)
dAmP.S (1to 5)
CAL.S (0.0 to 9999)
FUEL UnItS
(GAL US, GAL
ImP,LItrE)
dISt UnItS
(nAUt mILES,
StAt mILES)
or once or more, then ENT to select
LAMP (0to 4)
GrouP (0to 4)
or once or more,
then ENT to select
or to change a setting, ENT to confirm, then ESC for Setup Menu
or once or more, then ENT to select a setup menu
press
+ ENT
to reset
LOG
Note: hold
+ ENT for 5
secs resets
TOTAL LOG
or to choose
between Low Fuel
andbatteryalarms,
then ENT to select
press
+
to fill tank
hold +
ENTfor 5
secs resets
hours

8NAVMAN FUEL 3100 Installation and Operation Manual
3 The Main Display
3-3 Changing data quickly
Changing the fuel units:
Hold to change the units on the fuel data
option that is currently displayed (e.g., to
change between US gallons and litres). Note:
when “gal” is displayed, this could be US
gallons or imperial gallons. Check the units
menu to confirm and change if required. See
section 4-7 Units setup.
Changing the speed units:
Hold to change the units on the speed data
option that is currently displayed (e.g., to
change between nautical miles and statute
miles). The log units will change automatically
to correspond with the new speed units.
Resetting the trip log or total log:
When the desired log is displayed, hold and
ENT together to reset the reading to 0.0.
Refilling the fuel tank:
After refilling the fuel tank to maximum, press
and together while fuel remaining is
displayed sets REMAINING (fuel remaining) to
full. See section 4-3 Fuel setup for setting your
tank size.
Note: On boats with dual fuel tanks, check that
the tank displayed (PORT or STBD) is the tank
to be reset.
Note: This method is not recommended for
boats with underfloor fuel tanks. See section 4-
3 Fuel setup.
See section 4-7 Units setup, for more information
about customizing the FUEL 3100 to suit your boat
and preferences.
3-1 Fuel data
Thefueldatashowsone ofthefollowingfueloptions:
REMAINING (fuel remaining)
USED (fuel used)
FLOW (rate of fuel flow through the transducer)
ECONOMY (distancetravelled per unitof fuel used)
Press onceormoreto changethefueldataoption
thatiscurrently displayed(e.g., fromUSED toFLOW).
Ifyourboat hasportand starboardfueldataoptions,
pressENT tochange betweenthePORT,STBD, and
TOTAL fuel readouts on the main display.
3-2 Speed data
The speed data shows one of the following speed
options (if optional speed input is available):
LOG (trip distance)
TOTAL LOG (total distance)
hours (total engine hours)
RANGE (estimated distance that can be
travelled on the remaining fuel)
SPEED (boat speed)
Press once or more to change the speed data
option that is currently displayed (e.g., from SPEED
to LOG). Note: hours can be displayed with or
without speed input.
Warning
Fuel consumption can change drastically
depending upon the boat loading and the sea
conditions. Always carry adequate fuel for the
journey, plus a reserve.
Alarms symbol
shows either the Low
FuelAlarm and/or
Batteryis active.
Four keys (backlit)
Fuel data is shown in
the upper part of the
main display
Speed data is shown
in the lower part of
main display (if speed
input is available)
Fuel gauge shows
the fuel level in the
fuel tank(s).
Main Display
(backlit screen)

9
FUEL 3100 Installation and Operation Manual NAVMAN
3-4 Port and Starboard data options
Theportandstarboarddataoptionsavailabledepend
upon your boat configuration, as follows:
Single fuel tank / single engine / single fuel
transducer - no port and starboard data
options available.
Single fuel tank / twin engines / twin fuel
transducers - port and starboard readouts for
the fuel FLOW option only.
Twin fuel tanks / twin engines / twin fuel
transducers - port and starboard readouts for
all the fuel data options.
In addition, the fuel gauge splits into two columns;
the left column shows the fuel level in the port
fuel tank and the right column shows the fuel
level in the starboard fuel tank.
If your boat configuration can support
port and starboard readout capability,
see section 4-3 Fuel setup, to set it up.
Todisplaytheportorstarboardfueldata
ontheMain Display,selectthe required
fuel data option then press ENT to
change between the PORT, STBD and
TOTAL readouts.
Tochooseport orstarboarddataonthe
Fuel setup menu or Low Fuel Alarm setup menu,
selecttherequired optionandpressENT,thenpress
or to change between PORT and STBD. Press
ENT again to make changes.

10 NAVMAN FUEL 3100 Installation and Operation Manual
4 The Setup Menus It is essential to update this setting whenever any
fuel is added or removed. Otherwise, all the fuel
readings and the Low Fuel Alarm become
meaningless.
Quickrefill
To reset the fuel REMAINING
setting to the maximum tank
size, press and together.
Note: It is often very difficult to refill underfloor fuel
tanks to the same level twice, due to air pockets.
Becauseofthis,owners ofboats withunderfloor fuel
tanksarerecommendedtousethefollowingmethod
to update the setting.
1. Before doing a partial or full refill, or before
removing fuel from the fuel tank (e.g., by
siphoning it off): note the fuel REMAINING
reading.
2. Note how much fuel is added or removed.
3. Change the remaining fuel (FUEL) setting to
show how much fuel is now in the tank.
Setting number of fuel tanks (dUAL)
Select dUAL to set the number of fuel tanks.
Iftheboathastwinfueltanks,selectON automatically
activate the port and starboard data options.
If the boat has only one fuel tank, select OFF.
Setting fuel tank capacity (SIZE)
Select SIZE to specify the capacity of the fuel tank.
Onboatswithdual fueltanks,checkthat thefuel tank
displayed (PORT or STBD) is the fuel tank to be set.
Use the setup menus to customize the FUEL 3100
to suit your boat and preferences.
4-1 Entering setup mode
Press ESC and ENT together to enter setup mode.
Then press or once or more to show each of
the setup menus:
FUEL (Fuel) See section 4-3.
SPEEd (Speed) See section 4-4.
LAmP (Backlight) See section 4-5.
ALArm (Low Fuel and BatteryAlarm) See
section 4-6.
UnItS (Units) See section 4-7.
Press ENT to select a setup menu and show the
current setting.
4-2 Changing a setting
When the required setup menu is displayed, press
ENT. The current setting will blink on and off.
Increase or decrease the value of the setting by
pressing or . (Holding a key will change a
numeric setting more quickly.)
Press ENTtoconfirmthe newvalueorESC toreturn
to the previous setting without saving any changes.
4-3 Fuel setup (FUEL)
Use this to specify the settings for:
remaining fuel (FUEL)
number of fuel tanks (dUAL)
fuel tank capacity (SIZE)
number of engines (motor)
fuel calibration (CAL.F)
fuel flow transducer dampening (dAmP.F)
If your boat has port and starboard fuel data options,
pressENT,then press or tochangebetweenthe
PORT and STBD.PressENT again to make changes.
Setting remaining fuel (FUEL)
Select FUEL to update the setting for the remaining
fuel. On boats with dual fuel tanks, check that the
fuel tank displayed (PORT or STBD) is the fuel tank
to be reset.

11
FUEL 3100 Installation and Operation Manual NAVMAN
It is recomended that the fuel tank capacity is
measured by draining the fuel tank and then filling it
tocapacity.Afterfilling,note thethe readingfromthe
fuel dispenser’s guage.
Note: It is often very difficult to refill underfloor fuel
tanks to the same level twice, due to air pockets.
Warning
Fuel consumption can change drastically
depending upon the boat loading and the sea
conditions. Always carry adequate fuel for the
journey, plus a reserve.
Setting number of engines (motor)
Select motor to specify the number of engines on
theboat.
Thereisachoiceof1or2.If2isspecified,theportand
starboardfuelFLOW optionsareautomaticallyactivated.
Fuelcalibration (CAL.F)
Select CAL.F to calibrate a fuel flow transducer.
Calibrating the fuel usage is essential for accurate
fuel measurements.
Twin engine installations require each fuel flow
transducer to be calibrated.This can be done at the
same time with two portable tanks, or at different
times using one portable tank.
Calibrating the fuel flow transducer(s) requires
accuratemeasurementofthefuel consumption.This
is best done using a small portable tank. At least 4
gallons (15 litres) of fuel should be used to ensure
anaccuratecalibration.Themorefuelused,themore
accurate the calibration.
To calibrate the fuel flow transducer:
1. Connect the portable tank(s) to the engine
through the fuel flow transducers.
2. Run the engine and display USED (fuel used)
on the Main Display.
3. Press ENT and . To reset the reading to 0.
4. Run the engine at normal cruising speed until
a known amount of fuel, at least 4 gallons (15
litres), has been used per engine.
5. The USED readout shows the apparent
amount of fuel used.
6. Select the FUEL setup menu, then press or
until CAL.F is displayed, then press ENT.
(On boats with dual fuel tanks, select the fuel
flow transducer to be calibrated: PORT or STBD
then press ENT.)
7. If the CAL.F readout does not match the
known amount of fuel used, alter the readout
to match the known amount by pressing ENT
then or . Once you have the correct value
displayed, press ENT to save the correct value.
(Otherwise, press ESC to exit.)
SettingFuelFlowTransducerDamping
(dAmP.F)
Select dAmP.F to average the fuel flow transducer
readoutoveraselectedtimeperiod.Thisisknownas
damping.Itavoidsrapidchangesinthefuel datathat
is displayed, e.g., as the boat travels across waves.
Choose between 1 to 99 seconds of damping.
Selecttherequireddampinglevel.Onesecondgives
themostsensitivereading,howevershowsthe most
fluctuations.

12 NAVMAN FUEL 3100 Installation and Operation Manual
4-4 Speed setup (SPEEd)
Speeddisplaysand functionsareonly availableif an
instrument has speed input from GPS (via NMEA),
NavBus or an optional speed transducer.
Use this to specify the settings for:
source of the speed input data (INPUT)
Speed input via GPS versus paddlewheel.
GPS speed readings measure speed over ground. Paddlewheel transducers measure speed through the
water. As they calculate the speed differently, the displayed speed, trip log, economy and range differ for
each type. As a GPS receiver measures speed over the ground, it is more suitable and accurate for the
economy and range calculations than the paddlewheel speed.
calibration by log (CAL.L)
calibration by speed (CAL.S)
speed transducer damping level (dAmP.S)
TheCAL.L and CAL.S optionsare availableonly if
SEn is specified as the source of the speed data.
Example 1:
Time travelled: 1 hour
Speed of river: 5 knots
Fuel used: 3 gallons
Fuel remaining: 50 gallons
Paddlewheel (speed over water)
GPS (speed over ground)
Speed of river
Speed displayed Trip log Economy Range
Paddlewheel (speed over water) 10 knots 10 nm 3.3 nm/gal 165 nm
GPS (speed over ground) 15 knots 15 nm 5.0 nm/gal 250 nm
Paddlewheel (speed over water)
GPS (speed over ground)
Speed of river
Example 2:
Time travelled: 2 hours
Speed of river: 5 knots
Fuel used: 6 gallons
Fuel remaining: 50 gallons
Speed displayed Trip log Economy Range
Paddlewheel (speed over water) 15 knots 30 nm 5.0 nm/gal 250 nm
GPS (speed over ground) 10 knots 20 nm 3.3 nm/gal 165 nm

13
FUEL 3100 Installation and Operation Manual NAVMAN
Settingthespeedinputsource(InPUt)
Note: if connection via NavBus, the speed input is
automatically selected.
Select InPUt to specify the source of the speed input.
Note: A speed reading from the optional speed
transducer is the speed that the boat is moving
through the water. A speed reading from a GPS is
the speed over the ground. If there is any water
current then these two speeds will be different.
There is a choice of:
NO (No speed input available). If this is
selected, the only option available on Speed
data will be engine hours (HOURS).
GPS (NMEA- from other instruments). Note: a
GPS readout gives the speed over the ground.
This will produce a different fuel ECONOMY
reading when compared to input from a
paddlewheel speed transducer. )
SEn (optional paddlewheel speed transducer
connected directly to the FUEL 3100. See
section 5-5 Power and Wiring.)
Select the source of the speed data. Note: NavBus
is automatically detected.
Note:Ifcalibrationisrequiredwhenanother instrument
is the source of the speed data, use the calibration
procedure described in that instrument’s manual.
Settingthespeedtransducerdamping
level (dAmP.S)
This speed setup option is for use with transucers
directly connected to the FUEL 3100 and is only
availableif SEnisselectedasthespeedinputsource.
Select dAmP.S to average the speed readout
(damping) over a selected time period. Damping
avoids rapid changes in the speed data displayed;
e.g., as the boat travels across waves.
Choose from one of five damping levels:
1(6 seconds)
2(12 sconds)
3(18 seconds)
4(24 seconds)
5(30 seconds)
Select the required damping level.Level 1gives the
most responsive reading but also shows the most
fluctuations.
Speed calibration by log (CAL.L)
Select CAL.L to use the log to calibrate a
paddlewheel speed transducer that is connected
directly to the FUEL 3100. (SEn must have been
selected as the source of the speed input.)
1. Reset the trip log, LOG, to 0. Press ENT +
when LOG is displayed.
2. Travel a known distance in a straight line at a
speed between 5 and 20 knots. Best results
are achieved in calm conditions and with
minimal current (best at high or low tide). Tidal
effects can be reduced by making the trip once
in each direction, parallel to the current, to
averagethe distance.
3. Select SPEEd, then CAL.L. The FUEL3100
readout shows the apparent distance travelled.
4. If the readout does not match the known
distance, alter the readout to match the known
distance. (Otherwise, press ESC to exit.)
5. Press ENT to save the correct value.
Speed calibration by boat speed
(CAL.S)
SelectCAL.S tousetheboat’sspeedthroughthewater
to calibrate a paddlewheel speed transducer that is
connected directly to the FUEL 3100. (SEN must have
been selected as the source of the speed input.)
Note that for accurate calibration:
The speed from another paddlewheel
transducer should be between 5 and 20 knots.
Best results are achieved in calm conditions and

14 NAVMAN FUEL 3100 Installation and Operation Manual
with minimal current (best at high or low tide).
Therefore, travel at a constant, known speed and
calibrate the speed as follows:
1. Select SPEEd, then CAL.S.The FUEL3100
readout shows the apparent speed measured.
2. If the readout does not match the known speed,
press ENT then alter the readout to match the
known speed. (Otherwise, press ESC to exit.)
Note: After ENT is pressed, it does not matter
if the boat’s speed changes.
3. Press ENT again to save the correct value.
4-5 Backlight setup (LAmP)
Usethistosetthebacklightlevel andbacklightgroup
number.
Select the LAmP setupmenu, then selectLAmP to set
the backlight level. There is a choice of five backlight
levels: 00 (off) to 04 (bright). 03 is the default.
Select GrouP to set the backlight group number.
There is a choice of 0,1,2, 3, 4.
4-6Alarms setup (ALArm)
Use this to set the trigger level for the Low Fuel and
Battery alarms.
Low fuel alarm
1. Select the ALArm setup menu. (On boats with
dual fuel tanks, the Low FuelAlarm can be set
separately for each fuel tank. Press ENT, then
or to change between PORT and
STBD,then press ENT again.)
2. Enter the fuel level that will trigger the alarm
and press ENT to confirm.
The Low Fuel Alarm is on whenever a fuel level
greater than 0is entered. It isshown by the black
symbol in the top left corner of the display unit.
Whenthealarmsounds, theinternalbeepersounds,
the symbol,therelevantfuel gaugeonthe display
bothflashandanyexternalbeepersorlightsoperate.
Press ESC to mute the alarm.
Batteryalarm
1. Select the ALArm setup menu.
2. Press ENT, then or to select battery alarm
setup,then press ENT again.
3. Enter the battery voltage level that will trigger
the alarm and press ENT to confirm.
The Battery Alarm is on whenever a voltage level
greater than 0is entered. It isshown by the black
symbol in the top left corner of the display unit.
Whenthealarmsounds, theinternalbeepersounds,
the symbol flashes and any external beepers or
lights operate.
Press ESC to mute the alarm.
4-7 Units setup (UnItS)
Use this to choose the units for the:
Fuel:FUEL UnItS (GAL US, GAL ImP,
LItrE)
Log:dISt (nAUt, mILES, StAt mILES)
Select the UnItS setup menu, then select the
required units.
Selecting a unit for the log automatically sets the
correspondingunit forspeed. For example,selecting
StAT mILES automaticallysetsthespeedunittomPH.
The FUEL 3100 is set up with US Gallons, knots,
and nautical miles as the default.

15
FUEL 3100 Installation and Operation Manual NAVMAN
NavBusjunction box
(See section 5-5
Power and Wiring)
FUEL 3100 options:
Additional FUEL 3100 display
unit, includes this manual (Can
use second display unit to
repeat fuel data).
FUEL 3100 twin engine
updgradekit.
Note: Upgrades from single
engine to twin engine
applications. Comes with one
fuel transducer and ‘T’connector.
The ‘T’ connector is marked 2
(connects to port transducer) and 3 (connects
to starboard).
FUEL 3100 speed transducer options
Available in the following ready-to-install kits:
Note:Speed datacan alsobeinput frommostother
NAVMAN products that output speed data via
NavBus or NMEA; or most other brands via NMEA.
Other options
External beepers and/or lights (see section 5-5
Power and Wiring).
For systems of several instruments, wiring and
connectors are
required (see section
5-5 Power and Wiring,
or the NavBus
Installation and
Operation Manual ).
NAVMAN’sNavBus
junction box for
increased control and
simplified system
building.
Cables
4 m (13 ft) speed
transducerextension
cable.
Note: For the latest information on all options and
accessories, see www.navman.com or contact
your nearest NAVMAN dealer.
Display unit Protectivecover
Fuel flow transducer
and cable Plastic clips
5 Installation
Warnings
1. NAVMAN fuel flow transducers are NOT
suitedfor EFI(electronic fuelinjection) engines
with fuel return lines to the tank.
2. NAVMAN fuel flow transducers are designed
for use with marine gasoline inboard and
outboardengines. They mustNOTbeused with
Diesel engines.
Correct installation is critical to the performance of
theunit.Itisvitaltoreadtheentireinstallationsection
of this manual, and the documentation that comes
with any optional other parts, before starting the
installation.
For more information, refer to the installation
instructions supplied with the transducer, or consult
yourNAVMAN dealer.
5-1 What comes with the FUEL 3100?
Standard configuration
FUEL 3100 display unit
Protectivecover
Fuel flow transducer and cable 8 m (26¼ ft)
2 plastic clips for the fuel flow transducer
Warranty card
Mountingtemplate
This Installation and Operation Manual
Fuel Transducer InstallationManual
Transom
mount speed
transducer
Through hull
plastic speed
transducer
Through hull
bronzespeed
transducer

16 NAVMAN FUEL 3100 Installation and Operation Manual
Warnings
1. The display unit is waterproof from the front.
Protecttherear fromwater,otherwisewatermight
enter the breathing hole and damage the display
unit.Thewarrantydoes notcoverdamagecaused
by moisture or water entering the back of the
display unit.
2.Ensurethatanyholes cutfor theinstallationwill
notweakentheboat’sstructure.If indoubt,consult
a qualified boat builder.
The FUEL 3100 can be used with the following fuel
tank / engine configurations:
5-2 Tank / Engine Configurations
Twin fuel tanks / twin fuel lines / twin engines /
twin fuel transducers (below).
port
engine starboard
engine
port fuel
tank starboard
fuel tank
fuel flow
transducer
on each
fuel line
fuel flow
transducer cable
port engine starboard
engine
fuel tank
fuel line
fuel flow transducer cable
fuel flow
transducer
for each
engine
Single fuel tank / twin fuel lines / twin engines /
twin fuel transducers (below).
Single fuel tank / single fuel line / single engine
/ single fuel transducer (below).
fuel flow
transducer
cable
5-3 Installing the display unit
1 Choose a location for the display unit that:
is easily seen and protected from damage
is at least 100 mm (4") from a compass
and at least 500 mm (19.5") from a radio or
radarantenna.
is away from engines, fluorescent lights,
power inverters and radio or radar
transmitters.
is accessible from the back; a minimum
clearance of 50 mm (2") is required at the
back (see mounting diagram).
protects the back of the unit from moisture
and water.
2 The unit must be mounted on a flat panel less
than 20 mm (0.75") thick. Stick the mounting
template in place. Drill a 50 mm (2") fixing hole
through the centre hole in the template. Note
that the template allows space around the
display unit for the protective cover.
3 Remove the fixing nut from the back of the
display unit. Insert the stud at the back of the
display unit through the mounting hole. Hand
tighten the fixing nut.
Cables Clearance
50 mm (2") minimum
20 mm (0.75")
maximum thickness Fixing nut
Display
unit
Fixing hole
50 mm (2")
Side view of display unit mounting
single fuel
tank
single engine

17
FUEL 3100 Installation and Operation Manual NAVMAN
5-4 Installing the Fuel Flow Transducer
Install the fuel flow transducer after the FUEL3100
display unit is in position.
Refer to the seperate installation instructions
supplied with the fuel flow transducer.
5-5 Power and Wiring
The display unit requires a power supply between
10.5 and 16.5 V DC power.
The FUEL 3100 must be powered from the ignition
switch (not the auxilary switch or battery) for the
Engine Hours Counter to function properly.
Fittothe engineignition switchsupply viaa 1Afuse.
The FUEL 3100 alarm output is switched to ground,
30 VDCand250mAmaximum.Ifanyexternalalarms
require more than 250 mADC total, fit a relay.
Wiring a single unit
Wire the FUEL 3100 as shown below if it will be
used as a single unit:
Tape or cover any unused wires or connectors to
protectthemfromwaterandkeepthemfromshorting
together.
Wiring a system of several units
Several NAVMAN instruments can be connected
together to share data. There are two ways of
connectinginstrumentstogether,NavBusor NMEA.
NMEA
NMEAisan industry standardformarine instrument
connections. Data sent by one instrument over an
NMEA line can be read and displayed by another
instrumentthat accepts NMEA0183 Version 2 data.
Speed (RMC) can be received from another
instrument via NMEA and displayed by the
FUEL 3100.
Note: A speed reading from a paddlewheel sensor
isthespeedthattheboatismovingthroughthewater.
A speed reading from a GPS is the speed over the
Black
Red
External alarm
(optional)
Fuel transducer (white plug)
White
Green
Yellow
Orange
Blue
Speed transducer (blue plug)
NavBus (optional)
-
NMEA in (GPS, optional)
NMEA out (optional)
Ignition Switch
Fuse
}
Power/data cables
Junctionbox
Junctionbox
Power & data
connections
Power/data cable
NavBuscable
Group 1
Group 2
Power & data
connections
Tape or cover any unused wires or connectors to
protectthemfromwaterandkeepthemfromshorting
together.
ground. If there is a current then these two speeds
will be different.
NavBus
NavBusisaNAVMANproprietarysystemthatallows
systems of several instruments to be built using a
singlesetoftransducers.Itishighspeedand allows
awiderangeofdatatobesharedbytheinstruments.
When instruments are connected by NavBus:
if the units, alarms or calibration are changed
in one instrument, then the values will
automatically change in all instruments of the
same type.
each instrument can be assigned to a group of
instruments. Then, if the backlight setting is
changed in one group, it will automatically
change in other instruments in the same
group. However, changing the backlight setting
in an instrument in group 0 will not affect
instruments in different groups.
if an alarm sounds, mute it by clearing the alarm
on any instrument which can display that alarm.
Formoreinformation,refertothe
NavBusInstallation
and Operation Manual.
With several instruments, use the optional junction
boxes to simplify wiring, as shown below:

18 NAVMAN FUEL 3100 Installation and Operation Manual
5-6 Testing the installation
To check out the installation:
Power on the boat (and any instruments) to
check that the FUEL 3100 is working.
See section 4-3 Fuel setup, to select:
the number of tanks
the number of engines (this activates
the port and starboard options when
relevant).
the fuel tank size(s).
See section 4-7 Units setup, to select:
the fuel units
the log units.
If the unit is part of a system of 3100 series
instruments connected by NavBus, set the
backlight group number (see section 4-5
Backlight setup).
On boats with twin engines, check the
installation of the port and starboard
transducers by starting the port engine.
Confirm the fuel flow from the port fuel tank is
being displayed as port engine fuel usage on
the instrument. (If it is being displayed as
starboard engine fuel usage, swap over the
fuel flow transducer connectors on the ‘T’
connector.)
Take the boat for a trial run to check the data
inputs.
Calibrate the fuel (see section 4-3 Fuel setup).
Calibrate the speed (see section 4-4 Speed
setup).
Re-calibration of the FUEL 3100 is recommended
after the first 100 engine hours.
5-7 Resetting to factory defaults
All settings may be reset to the manufacturer’s
default settings (see below).
To reset to factory defaults:
1 Turn the power off.
2 Hold ENT + while turning on the power, and
continue to hold for at least five seconds.
Log units .................................................. knOtS
Fuel units.............................................. GALUS
Speed damping ...............................................2
Fuel damping ..................................................3
Low Fuel Alarm.......................................... OFF
BatteryAlarm ............................................. OFF
Trip log ............................................................0
Total log...........................................................0
Simulation mode........................................ OFF
BacklightLevel ................................................0
Backlight Group ...............................................1
Number of motors............................................1
Dual tank ................................................... OFF
Sensor ......................................................... NO
Tank size .........................................................0

19
FUEL 3100 Installation and Operation Manual NAVMAN
Physical
Case size 113 mm (4.4") square.
LCD display 82 mm (3.2") wide, 61 mm (2.4")
high; twisted nematic.
LCD digits 30 mm (1.2") high on top line,
20 mm (0.8") high on bottom line.
Four operator keys, laser etched.
Backlighting for display and keys, amber, four
levels and off.
Operating temperature 0 to 55°C (32 to 131°F).
Fuel flow transducer cable 8 m (26.25 ft).
Power Cable 1.1 m (3.25 ft).
Electrical
Power supply 10.5 to 16.5 V DC, 30 mA without
backlighting, 80 mA with full backlighting.
External alarm (beeper and/or light output,
switched to ground, 30 V DC and 250 mA
maximum).
Fuel
Displays fuel used, fuel remaining, rate of fuel
flow, and the fuel economy.
Range 0 to 9999 with resolution of 0.1 unit for
the first 999 units, thereafter resolution of 1.0
unit.
Log
Displays trip log and total log.
Range 0 to 9999 miles or nautical miles.
Engine Hours
Displays 0.0 to 9999.
Speed (if optional speed transducer installed)
Displays current speed, average speed,
maximum speed.
Range 0 to 100 knots (0 to 115 mph).
Speed resolution of 0.1 unit.
Adjustable damping for speed and log gives
stable readings in all sea conditions by
averaging the readings. Damping values
available are:
1 (6 seconds)
2 (12 sconds)
3 (18 seconds)
4 (24 seconds)
5 (30 seconds)
Calibration
Fuel can be calibrated. Speed can also be
calibrated if the optional speed transducer is
installed.
Appendix A - Specifications Interfaces
External alarm.
NavBusconnectionto other NAVMAN
instruments.
NMEA0183 instruments. 0183 outputs: PTTKV,
VHW, XDR, VLW; input RMC.
Standards compliance
EMC compliance
USA (FCC): Part 15 Class B.
Europe (CE): EN50081-1, EN50082-1,
EN55024,EN55022, ISO7637-1.
New Zealand and Australia (C Tick) :
AS-NZS3548.
Environment: IP66 from front when correctly
mounted on the bulkhead.
Wire Signal
Red Power positive, 12 V DC,
100 mA maximum
Black Ground/Shield (NMEA common)
Green External alarm, switched to ground,
30 V DC and 250 mA max.
Orange NavBus+
Blue NavBus-
White NMEA(output)
Yellow NMEA(input)

20 NAVMAN FUEL 3100 Installation and Operation Manual
Appendix B - Troubleshooting
Thistroubleshootingguideassumesthatthismanual
has been read and understood.
It is possible in many cases to solve difficulties
without having to send the unit back to the
manufacturer for repair. Please follow this
troubleshooting section before contacting the
nearest NAVMAN dealer.
There are no user serviceable parts. Specialized
methods and testing equipment are required to
ensure that the unit is reassembled correctly and is
waterproof. Repairs to the unit must only be carried
out by a service centre approved by Navman NZ
Limited. Users who service the unit themselves will
voidthe warranty.
More information can be found on our Website:
www.navman.com
1 FUEL 3100 will not turn on:
a Power/data cable is damaged or disconnected.
Perform a visual check.
b Fuse is blown or circuit breaker has tripped.
Replace the fuse or reset the circuit breaker.
c Battery voltage is outside the range 10.5 to
16.5 V DC. Check the battery voltage using a
multimeter.
2 The word SIM flashes at bottom left corner of
screen, values displayed are unexpected:
a The FUEL 3100 is in simulation mode (see
section 2-6 Simulation mode).
3 Fuel reading is wrong or erratic:
a Check for leaks in the fuel line or in the fuel
pickup in the tank.
b Fuel transducer cable is unplugged or
damaged. Perform a visual check.
c Calibration is incorrect (see section 4-3 Fuel
setup).
d The fuel REMAINING reading is incorrect. The
fuel tank capacity (SIZE) may be incorrect, or the
fuelREMAINING settingmaynot havebeen
updated after a refill. See section 4-3 Fuel setup.
e The fuel flow transducer may have been mounted
too close to the fuel pump, or may be subject to
excessivevibration. Refer to theinstallation
instructions supplied with the fuel transducer.
f The Fuel Flow Transducer damping (dAmP.F)
value is not suitable for the engine. Check that
the value is not set to zero, and then try
increasing the value until a steady flow rate is
shown. See section 4-3 Setup > Fuel.
4 Speed reading is wrong or erratic:
a Speed transducer cable is unplugged or
damaged. Perform a visual check.
b Calibration is incorrect (see section 4-4 Speed
setup).
c Interference from electrical noise may be affecting
the FUEL3100. Review the installation (see
section 5-3 Installing the display unit, and section
5-4 Installing the Fuel Flow Transducer).
5 Low Fuel Alarm sounds when fuel tank full:
a The fuel REMAINING reading is incorrect. The
fuel tank capacity (SIZE) may be incorrect, or the
fuelREMAININGsettingmaynothavebeen
updated after a refill. See section 4-3 Fuel setup.
6 The display unit fogs:
a Moist air has entered the breathing tube at the
rear of the unit.Air the boat or run the
FUEL 3100 with backlight fully on.
b Water has entered the breathing tube. Return
the FUEL 3100 for servicing.
7. Flow indicates no fuel or low fuel
a) Check that the fuel cable connectors are
securely plugged in and the collar is locked in
place. The collar must be locked in place to
give a watertight connection.
b) A fuel transducer may be clogged. If so,
remove the transducer from the fuel line and
gently blow through it in the opposite direction
to the fuel flow. Afuel filter between the fuel
transducer and the fuel tank must be installed
as per the fuel installation guide. Failure to do
so will void the warranty.
c) Inspect the fuel cable from end to end for
damage such as cuts, breaks, squashed or
trapped sections.
d) Check that the fuel filter is clean.
8. Fuel used or remaining seem inaccurate:
a) In rough seas, fuel may surge back and forth
through the fuel transducer, resulting in incorrect
readings. Try installing a one-way valve between
the fuel transducer and the fuel tank.
b) The Remaining fuel value must be reset after
every refuelling (see section 4-3 Fuel Setup).
c) The fuel tank may not refill to the same
capacity each time due to air pockets. This is
particularly noticable with underfloor tanks.
d) Fuel transducers wear out over time and should
be replaced after every 5000 litres of fuel.
9. A twin engine installation shows only one
flow rate:
a) Check that the number of engines is set to 2.
See section 4-3 Fuel Setup.
10. There is no reading for fuel economy:
a) The boat must be travelling through the water
to generate an Economy reading.
b) Check that the paddlewheel on the transducer
is spinning freely, and that the two magnets in
the paddlewheel are still in place.

21
FUEL 3100 Installation and Operation Manual NAVMAN
Appendix C - How to contact us www.navman.com.
NORTH AMERICA
Navman USA Inc.
18 Pine St. Ext.
Nashua,
NH 03060.
Ph: [phone]
Fax: [phone]
e-mail: [email protected]
web: www.navman.com
Toll Free: 866 NAVMAN1 or
866-628-6261
OCEANIA
Australia
Navman Australia Pty. Limited
Unit 2 / 5-13 Parsons St.
Rozelle,
NSW 2039,
Australia.
Ph: [phone]
Fax: [phone]
e-mail: [email protected]
web: www.navman.com
New Zealand
Absolute Marine Ltd.
Unit B, 138 Harris Road,
East Tamaki,
Auckland.
Ph: [phone]
Fax: [phone]
e-mail:
[email protected]
Papua New Guinea
Lohberger Engineering,
Lawes Road, Konedobu.
PO Box 810,
Port Moresby.
Ph: [phone]
Fax: [phone]
e-mail: [email protected]
web: www.lohberger.com.pg
SOUTH AMERICA
Argentina
Costanera Uno S.A.
Av Presidente R Castillo y Calle 13
1425 Buenos Aires,
Argentina.
Ph: [phone]
Fax [phone]
e-mail:
[email protected]
web: www.costanerauno.ar
Brazil
Equinautic Com Imp Exp de
Equip Nauticos Ltda.
Rua Ernesto Paiva, 139
Clube dos Jangadeiros
Porto Alegre - RS - Brasil
CEP: 91900-200.
Ph: [phone]
[phone]
Fax: [phone]
e-mail:
[email protected]
web: www.equinautic.com.br
Realmarine
Estrada do Joa 3862,
Barra da Tijuca,
Rio de Janeiro, Brazil.
CEP: 22611-020.
Ph: [phone]
Fax: [phone]
e-mail: [email protected]
web: www.realmarine.com.br
ASIA
China
Peaceful Marine Electronics Co. Ltd.
Guangzhou, Hong Kong, Dalian,
Qingdao, Shanghai
1701 Yanjiang Building
195 Yan Jiang Zhong Rd. 510115
Guangzhou, China
Ph: [phone]
Fax: [phone]
e-mail: [email protected]
web:www.peaceful-marine.com
India
Access India Overseas Pvt. Ltd.
A-98, Sector 21,
Noida - 201 301,
India.
Ph: [phone]
TeleFax: [phone]
Mobile: [phone]
e-mail: [email protected]
Indonesia
Polytech Nusantara,
Graha Paramita 2nd Floor,
Jln Denpasar Raya Blok D2
Kav 8 Kuningan,
Jakarta 12940.
Ph: [phone]
Fax: [phone]
e-mail: [email protected]
Korea
Kumhomarine Technology Co. Ltd.
#604-842, 2F, 1118-15,
Janglim1-Dong,
Saha-Gu,
Busan, Korea.
Ph: [phone]
Fax: [phone]
e-mail: [email protected]
web: www.kumhomarine.com
Maldives
Maizan Electronics Pte. Ltd.
Henveyru,08 Sosunmagu.
Male', Maldives,
Mobile: [phone]
Ph: [phone]
Fax: [phone]
e-mail: [email protected]
Singapore, Malaysia, Brunei,
Indonesia and Phillipines
RIQ PTE Ltd.
Blk 3007, Ubi Road 1,
#02-440,
Singapore 408701.
Ph: [phone]
Fax : [phone]
e-mail: [email protected]
Taiwan
Seafirst International Corporation
No. 281, Hou-An Road,
Chien-Chen Dist.
Kaohsiung,
Taiwan R.O.C.
Ph: [phone]
Fax: [phone]
e-mail: [email protected]
Thailand
Thong Electronics (Thailand)
Company Ltd.
923/588 Thaprong Road,
Mahachai, Muang,
Samutsakhon 74000, Thailand.
Ph: [phone]
Fax: [phone]
e-mail: [email protected]
Vietnam
Haidang Co. Ltd.
16A/A1E, Ba thang hai St.
District 10, Hochiminh City.
Ph: [phone]
Fax: [phone]
e-mail: [email protected]
web: www.haidangvn.com