GPI M30-G8N User manual

5-30 GPM
(19-114 L/min)
Fuel Meter
Models M30-G8N, M30-L8N
Product Owner’s Manual EN
921529-01 Rev A6/2019

Please save these instructions for future reference. Read carefully before attempting
to assemble, install, operate or maintain the product described.
Protect yourself and others by observing all safety information. Failure to comply
with instructions could result in personal injury and/or property damage.
Please refer to back cover for information regarding this product’s warranty and
other important information.
Thank you for choosing a Great Plains Industries product, and
congratulations on your purchase!
Headquartered in the heartland of the U.S., GPI strives
for integrity, innovation, continuous improvement, and
dependability—values you will immediately recognize when using
our products.
The maintenance policies and procedures outlined in this manual
emphasize our commitment to safety and our dedication to you
as a customer. By working together, we can ensure years of
reliable, quality service.
SAVE FOR YOUR RECORDS
Model #: ___________________
Serial #: ___________________
Purch. Date: _______________
DO NOT RETURN THIS PRODUCT TO THE STORE!
Please contact Great Plains Industries, Inc. before returning any product. If you are
missing parts, or experience problems with your installation, contact our Customer
Support Department. We will be happy to assist you.
Call: 800-835-0113 or 316-686-7361
Email: [email protected]

SAFETY /
SPECIFICATIONS
ASSEMBLY /
INSTALLATION OPERATION TROUBLESHOOTING MAINTENANCE /
REPAIR
GETTING STARTED
tools.eps
box.eps
magnify_2.eps
warning symbol.eps
measure.eps
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megaphone.eps
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Caution.eps
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Electrical_Caution.eps
Face_protection.eps
Fall_Hazard.eps
Fall_protection.eps
GearHand_Hazard.eps
Head_protection.eps
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Temp_Caution1.eps
body_protection.eps
chemical_Caution.eps
ear_protection1.eps
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foot_protection.eps
hand_protection.eps
tools.eps
box.eps
magnify_2.eps
warning symbol.eps
measure.eps
plug.eps
oil.eps
megaphone.eps
biohaz.eps
Battery_Caution1.eps
Caution.eps
Crush_Caution1.eps
Electrical_Caution.eps
Face_protection.eps
Fall_Hazard.eps
Fall_protection.eps
GearHand_Hazard.eps
Head_protection.eps
Heavy_Hazard.eps
Hot_surface.eps
Recycle.eps
Resp_protection1.eps
Resp_protection2.eps
Temp_Caution1.eps
body_protection.eps
chemical_Caution.eps
ear_protection1.eps
explosive_caution.eps
eye_protection1.eps
foot_protection.eps
hand_protection.eps
tools.eps
box.eps
magnify_2.eps
warning symbol.eps
measure.eps
plug.eps
oil.eps
megaphone.eps
biohaz.eps
Battery_Caution1.eps
Caution.eps
Crush_Caution1.eps
Electrical_Caution.eps
Face_protection.eps
Fall_Hazard.eps
Fall_protection.eps
GearHand_Hazard.eps
Head_protection.eps
Heavy_Hazard.eps
Hot_surface.eps
Recycle.eps
Resp_protection1.eps
Resp_protection2.eps
Temp_Caution1.eps
body_protection.eps
chemical_Caution.eps
ear_protection1.eps
explosive_caution.eps
eye_protection1.eps
foot_protection.eps
hand_protection.eps
tools.eps
box.eps
magnify_2.eps
warning symbol.eps
measure.eps
plug.eps
oil.eps
megaphone.eps
biohaz.eps
Battery_Caution1.eps
Caution.eps
Crush_Caution1.eps
Electrical_Caution.eps
Face_protection.eps
Fall_Hazard.eps
Fall_protection.eps
GearHand_Hazard.eps
Head_protection.eps
Heavy_Hazard.eps
Hot_surface.eps
Recycle.eps
Resp_protection1.eps
Resp_protection2.eps
Temp_Caution1.eps
body_protection.eps
chemical_Caution.eps
ear_protection1.eps
explosive_caution.eps
eye_protection1.eps
foot_protection.eps
hand_protection.eps
BEFORE YOU BEGIN
Usage Requirements
• This manual covers fuel meter models M30-G8N and M30-L8N
• This fuel meter is designed, tested and approved for use with thin
viscosity petroleum fuels such as gasoline blends (up to E15), diesel
fuel blends (up to B20) and kerosene.
Please take all due precautions when handling these flammable liquids.
• Do not use this meter for measuring any fluids other than those for
which it was designed. To do so may damage the meters’ components
and will void the warranty.
• The M30 Mechanical Fuel Meter is designed for the field measurement
of thin viscosity petroleum fuels only and intended for use with pump
systems in the 5 to 30 GPM or 19 to 114 L/m flow range (not intended
for gravity flow systems). Using mechanical gears, these meters
translate flow data from a nutating disk into calibrated units which are
indicated on the face of the meter. This meter is factory calibrated for
diesel fuel. A field calibration feature is available for other fluids (see
Calibration section).
Tools Needed
• 10mm Open-end Wrench, Hex Wrenches (Hex Keys, 3mm & 5mm),
Thread Tape pr Pipe Thread Sealing Compound (approved for use with
flammable liquids)
UNPACKING
Contents
• (1) Nutating Disc Fuel Meter, U.S. Gallon or Litre Version
• (1) Register Knob
• (1) 1 in. NPT Inlet Fitting with O-ring and mounting screws
• (1) 1 in. NPT Outlet Fitting with O-ring and mounting screws
Inspect
• After unpacking the unit, inspect carefully for any damage that may
have occurred during transit. Check for loose, missing or damaged
parts. Shipping damage claims must be filed with carrier.
• Review General Safety Instructions and all Caution, Warning, and
Danger statements as shown.
3

4
MAINTENANCE /
REPAIR TROUBLESHOOTING OPERATION GETTING STARTED
ASSEMBLY /
INSTALLATION
SAFETY /
SPECIFICATIONS
GENERAL SAFETY INSTRUCTIONS
IMPORTANT: It is your responsibility to:
• Know and follow applicable national, state and local safety codes
pertaining to installing and operating electrical equipment for use with
flammable liquids.
• Know and follow all safety precautions when handling petroleum fuels.
• Ensure that all equipment operators have access to adequate
instructions concerning safe operating and maintenance procedures.
Observe all safety precautions concerning safe handling of petroleum fuels.
To prevent physical injury or property damage, observe
precautions against fire or explosion when dispensing
fuel. Do not operate the meter in the presence of any source of ignition including
running or hot engines, lighted tobacco products, gas or electric heaters, or any
type of electronic device. A spark can ignite fuel vapors.
Avoid prolonged skin contact with petroleum fuels. Use
protective goggles, gloves and aprons in case of
splashing or spills. Change saturated clothing and wash skin promptly with
soap and water.
Any components such as hose, nozzle, or pump added to
your meter must be statically grounded and approved for
use with petroleum fuels.
This product shall not be used for pumping fuel or other
liquids into aircraft.

5
GETTING STARTED ASSEMBLY /
INSTALLATION OPERATION TROUBLESHOOTING MAINTENANCE /
REPAIR
SAFETY /
SPECIFICATIONS
SPECIFICATIONS
M30-G8N
(GALLON MODEL)
M30-L8N
(LITRE MODEL)
Unit of Measure U.S. Gallon Litre
Flow Range 5 to 30 GPM 19 to 114 L/min
Operating Temperature -20° F to 125° F -29° C to 52° C
Typical Accuracy ± 2%
Technology Nutating Disc
Housing, Cover, Fittings Aluminum
Maximum Working
Pressure 50 PSIG / 3.4 bar
Pressure Drop (at Max.
Flow)
Diesel: 7.0 PSI / 0.5 bar
Unleaded: 5.0 PSi / 0.3 bar
Inlet/Outlet Threads 1 in. NPT
Maxium Batch Total 999.9
Maximum Cumulative Total 999,999.9
Weight 8.1 lbs 3.7 kg
Maximum Dimensions
Width: 5.9 in. 15.0 cm
Height: 7.9 in. 20.0 cm
Depth: 5.3 in 13.3 cm
Wetted Materials
Nutator Assembly PBT (Polybutylene Terephthalate), Stainless Steel
Seals NBR (Nitrile Butadiene Rubber)
Mag-Drive Acetal, Stainless Steel, Neodymium (Nickel Plated)
Approvals
NOTE: Accuracy is factory calibrated using diesel fuel. Field calibration is available on
all models.

MAINTENANCE /
REPAIR TROUBLESHOOTING OPERATION GETTING STARTED
6
ASSEMBLY /
INSTALLATION
SAFETY /
SPECIFICATIONS
Figure 1
SPECIFICATIONS (CONTINUED)
M30-G8N, M30-L8N
Dimensions
A. Meter Assy Width 5.91 in. (15.01 cm)
B. Meter Assy Height 7.88 in. (20.01 cm)
C. Meter Assy Depth 5.21 in. (13.23 cm)
B
A
C

7
GETTING STARTED OPERATION TROUBLESHOOTING MAINTENANCE /
REPAIR
SAFETY /
SPECIFICATIONS
ASSEMBLY /
INSTALLATION
INSTALLATION INSTRUCTIONS
Your system must be installed on a vented tank. If the
tank is unvented, your local dealer or distributor can
supply a pressure cap.
If the meter is located in a rigid piping system where the
fluid is trapped (for example, by gravity, valves or
nozzles) thermal expansion of the fluid can create pressure spikes that can
damage a meter. Install a thermal relief valve or otherwise allow for thermal
expansion of the fluid.
Before Installing
NOTE: All threaded fuel connections must be sealed with thread tape or a
pipe thread sealing compound approved for use with petroleum fuels and
tightened securely to prevent leakage.
Before installing your meter, review the safety instructions in the General
Safety Instructions section at front of manual. Examine your meter to
make sure there are no visible signs of shipment damage. Plan your meter
installation by reviewing the following procedures. Prior to installation,
determine the orientation of the meter body required for the system. The
arrows on the housing are there to indicate flow direction and assist in this
process (see Figure 2).
Figure 2
Flow Direction
Arrows

MAINTENANCE /
REPAIR TROUBLESHOOTING SAFETY /
SPECIFICATIONS GETTING STARTED
8
OPERATION ASSEMBLY /
INSTALLATION
Change Register Orientation
NOTE: If the meter is plumbed in any orientation other than bottom-up flow,
the register may need to be reoriented.
1. Using a 3mm L-hex wrench, remove the (4) screws that hold register in
place
2. Rotate the register to the desired orientation, making sure the O-ring is
fully seated (see Figure 3).
3. Reattach the register using the (4) screws previously removed
(see Figure 3).
INSTALLATION INSTRUCTIONS (CONTINUED)
Figure 3
Figure 4a
O-ring
Position Lug (4)

9
GETTING STARTED SAFETY /
SPECIFICATIONS OPERATION MAINTENANCE /
REPAIR
TROUBLESHOOTING
ASSEMBLY /
INSTALLATION
INSTALLATION INSTRUCTIONS (CONTINUED)
Figure 4a Figure 4b Figure 4c
Modular Connection Types
Installation Meter - Threaded Connection
1. Remove protective plugs from the meter inlet and outlet ports.
2. Wrap threaded male connections with thread tape or use a pipe sealant
compound compatible with petroleum fuels.
3. Install the meter using appropriately sized fittings. “INLET” and
“OUTLET” threads are labeled to assist piping connections.
4. Install other system components on the meter and tighten snugly.
Installation Meter - Modular Connection
1. Using a 5mm hex wrench and 10mm open-end wrench, remove inlet
and outlet fitting. They will not be used in the modular connection
(see Figure 4a).
2. Using 5mm hex wrench, remove the outlet of modular pump and
reattach it to the outlet flange of the meter, making sure the O-ring is
fully seated (see Figure 4b).
3. Using the hex bolts removed in step 1, attach meter inlet flange to
pump outlet flange, making sure O-ring is fully seated (see Figure 4b.
NOTE: If modular filter adapter is also used in set-up, first attach filter
adapter to pump outlet then attach the meter and filter to the filter adapter
(see Figure 4c).
4. Install other system components on the meter and tighten snugly.
Outlet
Fitting
Intlet
Fitting
Outlet
Fitting
Meter
Filter
Adapter
Pump
Filter

MAINTENANCE /
REPAIR OPERATION ASSEMBLY /
INSTALLATION
SAFETY /
SPECIFICATIONS GETTING STARTED
10
TROUBLESHOOTING
OPERATION (CONTINUED)
Always follow safety precautions when operating this
equipment. Review the General Safety Instructions at
front of manual.
IMPORTANT: Before each use, visually check the meter to ensure it is
securely connected to other system components and there is no leakage.
Promptly wipe spilled fuel from the meter’s exterior and other system
components.
NOTE: The large meter display represents the Batch Total for each fuel
delivery. Before dispensing, reset the Batch Total to zero by turning the
knob (see Figure 5)
NOTE: The small display represents the Cumulative Total of all fuel
deliveries and cannot be reset.
Calibration
The Calibration Screw is located on the side of the meter (see Figure 6) and
can be adjusted with a 3mm hex wrench. The meter is accurately calibrated
at the factory for use with diesel fuel. In the event the screw is accidentally
moved, the meter will need to be recalibrated. To recalibrate the meter for
diesel fuel, turn the screw completely in (clockwise) then back out (counter-
clockwise) 3 turns.
To recalibrate the meter for gasoline, turn the screw completely in
(clockwise). The Cal-screw does not need to be turned back out for
gasoline.
Due to differences in viscosity and flow rates, the meter may require
recalibration to measure other fluids or to adjust for inaccuracies.
In general, if the register indicates less than what is dispensed, the
Cal-Screw needs turned in; if the register indicates more than what was
dispensed, the Cal-Screw needs turned out.
NOTE: Never back the Cal-Screw out more than 12 turns from completely
closed. Doing so could inhibit the seal resulting in leaking.
Figure 5
Cal-Screw
Register
Knob

11
GETTING STARTED SAFETY /
SPECIFICATIONS
ASSEMBLY /
INSTALLATION OPERATION
Symptom Possible Cause(s) Corrective Action
A. Meter counter
does not operate
(Normal fuel
delivery)
1. Dirty register 1. Clean register
2. Broken register 2. Replace register
3. Foreign mateial in register
or nutator assembly
3. Remove and clean register or
nutator assembly
B. Meter counter
does not operate
(Little or no fuel
flow)
1. Other system components
malfunctioning
1. Check all system components
(tank to nozzle) for clogs and/or
malfunctions. Repair as needed
2. Foreign material in meter
housing
2. Clean meter housing
C. Fuel leakage 1. Leakage between
coverplate and housing
1. Remove coverplate and inspect
for damaged, missing or
incorrectly seated seal. Replace
as required
2. Leakage at fittings 2. Remove fittings and inspect for
damaged, missing or incorrectly
seated seals. Replace as
required
3. Leakage at threads 3. Remove meter and reseal all
threaded connections with
thread tape or pipe thread
sealing compound approved for
use with flammable liquids
TROUBLESHOOTING
MAINTENANCE /
REPAIR
TROUBLESHOOTING

TROUBLESHOOTING OPERATION ASSEMBLY /
INSTALLATION
SAFETY /
SPECIFICATIONS GETTING STARTED
12
MAINTENANCE
NOTE: This meter is designed for minimum maintenance. Inspect meter and
components regularly for fuel leaks. Keep the meter exterior clean to help
identify leaks.
IMPORTANT: This fuel meter is designed, tested and approved for
use with thin viscosity petroleum fuels such as gasoline blends (up to
E15), diesel fuel blends (up to B20) and kerosene (see BEFORE YOU
BEGIN: Usage Requirements at front of manual). Use of the meter with
unauthorized fluids will void the warranty.
Clean Register and Nutator Assembly
1. Turn the system off and disconnect from power. Remove the coverplate
and O-ring, and inspect for damage (see Figure 6). If O-ring is
damaged, replace.
2. Remove (2) register screws and register from cover plate. Clean
register with a soft-bristled brush and solvent. If the register is very
dirty, compressed air may be used. Replace register.
3. Remove the gearplate and O-ring from the backshell, and inspect for
damage (see Figure 6). If O-ring is damaged, replace.
4. Remove (2) nutator assembly screws and nutator assembly from back
shell. Clean nutator assembly with a soft-bristled brush and solvent.
If the nutator assembly is very dirty, compressed air may be used.
Replace nutator assembly.
5. Coat the O-rings lightly with grease. Reinstall meter components.
Ensure the O-rings are properly seated and tighten securely.
MAINTENANCE /
REPAIR

13
GETTING STARTED SAFETY /
SPECIFICATIONS
ASSEMBLY /
INSTALLATION OPERATION TROUBLESHOOTING
REPAIR
IMPORTANT: Carefully inspect all parts for wear or damage. Replace
components, as necessary. The Illustrated Parts List gives information
on replacement parts and kits. Review the Safety Instructions before
proceeding.
Avoid prolonged skin contact with petroleum fuels. Use
protective goggles, gloves and aprons in case of
splashing or spills. Change saturated clothing and wash skin promptly with
soap and water.
Service O-rings
NOTE: A Wet Seal Kit contains all seals for your meter and should be
on hand when performing repairs. Old seals may then be replaced with
new seals.
1. In general, when inspecting O-rings, look for breaks, wear, and signs
of deterioration, such as swelling.
2. Replace, as necessary.
3. Before seating, coat O-rings with light grease.
MAINTENANCE /
REPAIR
Figure 6


O-ring
Backshell
Nutator
assembly
Coverplate
Register
Gearplate

14
REPAIR PARTS ILLUSTRATION FOR M30-G8N AND M30-L8N
PARTS & SERVICE
For warranty consideration, parts, or other service information, please
contact your local distributor. If you need further assistance, contact the GPI
Customer Service Department in Wichita, Kansas, during normal business
hours.
A toll free number is provided for your convenience.
1-800-835-0113
To obtain prompt, efficient service, always be prepared with the following
information:
• The model number of your meter.
• The manufacturing date located on the back of your meter.
• Part descriptions and numbers.
For warranty work, always be prepared with your original sales slip or other
evidence of purchase date.
Do not return the pump or parts without prior approval
from the GPI Customer Service Department. Due to strict
government regulations governing flammable liquids, meters may be refused
and returned to the sender if sent without authorization. GPI cannot accept parts
unless they have been drained and cleaned. Before packing for shipment, make
sure meter is thoroughly drained, and free of fuel and vapors.
TROUBLESHOOTING OPERATION ASSEMBLY /
INSTALLATION
SAFETY /
SPECIFICATIONS GETTING STARTED
MAINTENANCE /
REPAIR


21
4
3
5

15
GETTING STARTED SAFETY /
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ASSEMBLY /
INSTALLATION OPERATION TROUBLESHOOTING MAINTENANCE /
REPAIR
REPAIR PARTS LIST FOR M30-G8N AND M30-L8N
Ref.
No. Description Part Number Qty.
1 M30 Seal Kit 165700-01 1
O-rings (various sizes) ▲6
Grommet ▲1
21 in NPT Fitting Kit 165700-02 1
Inlet NPT tting ▲1
Outlet NPT tting ▲1
Flange O-ring ▲2
M6-1.0 X 20mm Hex Head Cap Screw ▲8
3Knob Kit (includes 1 reset knob) 165700-04 1
4Counter Assembly (Register) Kit 165700-05 1
5 Gallon Decal Kit 165700-06 1
5Litre Decal Kit 165700-07 1
(▲) Available as part of kit only.
IMPORTANT: Please contact GPI before returning any parts. It may be
possible to diagnose the trouble and identify needed parts in a telephone
call. GPI can also inform you of any special requirements you will need to
follow for shipping fuel dispensing equipment.

© 2019 Great Plains Industries, Inc., All Rights Reserved.
Great Plains Industries, Inc. / 800-835-0113 / GPI.net
921529-01 Rev A6/2019
GPI®FOUR-YEAR LIMITED WARRANTY
Great Plains Industries, Inc. 5252 E. 36th Street North, Wichita, KS USA 67220-3205,
hereby provides a limited warranty against defects in material and workmanship on all
products manufactured by Great Plains Industries, Inc. This product includes a 4 year
warranty from date of purchase as evidenced by the original sales receipt. A 54 month
warranty from product date of manufacture will apply in cases where the original sales
receipt is not available. Reference product labeling for the warranty expiration date based
on 54 months from date of manufacture. Manufacturer’s sole obligation under the foregoing
warranties will be limited to either, at manufacturer’s option, replacing or repairing defective
goods (subject to limitations hereinafter provided) or refunding the purchase price for
such goods theretofore paid by the buyer, and buyer’s exclusive remedy for breach of any
such warranties will be enforcement of such obligations of manufacturer. The warranty
shall extend to the purchaser of this product and to any person to whom such product is
transferred during the warranty period. This warranty shall not apply if:
A. the product has been altered or modified outside the warrantor’s duly appointed
representative;
B. the product has been subjected to neglect, misuse, abuse or damage or has been
installed or operated other than in accordance with the manufacturer’s operating
instructions.
To make a claim against this warranty, contact the GPI Customer Service Department at
316-686-7361 or 800-835-0113.
Or by mail at:
Great Plains Industries, Inc.
5252 E. 36th St. North
Wichita, KS, USA 67220-3205
The company will guide you through a product troubleshooting process to determine
appropriate corrective actions.
GREAT PLAINS INDUSTRIES, INC., EXCLUDES LIABILITY UNDER THIS WARRANTY
FOR DIRECT, INDIRECT, INCIDENTAL AND CONSEQUENTIAL DAMAGES INCURRED
IN THE USE OR LOSS OF USE OF THE PRODUCT WARRANTED HEREUNDER.
The company herewith expressly disclaims any warranty of merchantability or fitness for
any particular purpose other than for which it was designed.
This warranty gives you specific rights and you may also have
other rights which vary from U.S. state to U.S. state.
Note: In compliance with MAGNUSON-MOSS CONSUMER WARRANTY ACT –
Part 702 (governs the resale availability of the warranty terms).