The Measure f Excellence
11616 Harry Hines Blvd. •P.O. Box 29242 •Dallas, TX 75229 •(972) 241-2161 • FAX (972) 620-3374
Website
http://www.rochestergauges.com •
E-mail
info@rochestergauges.com
Step 1.
(This usually s lves the pr blem)
Before you do anything else, check for defective wiring or grounds
as this is the most common cause of indicator system fail ures.
nspect all wiring and terminals. Also look for cor ro sion on fuel tank
ground connection.
Step 2.
f pointer in indicator does not move when ignition switch is turned
on, check to see that voltage is actually being carried from the igni-
tion switch to the GN terminal on the indicator. The voltage meas-
ured between the GN terminal of level indicator and ground should
be 12 to 24 Volts, depending upon the indicator.
The voltage measured between the SEND terminal of level indicator
and ground should always be less than 12 Volts. Also check to
assure that paint or corrosion does not prevent proper indicator
ground.
Step 3.
f the indicator reading is not accurate with tank level, use a resist-
ance substitution device to verify that the indicator resistance input
requirements are the same as the sender output resistance. The
sender and receiver must be matched to get an accurate reading.
For example: 240 OHMS at “E” and 30 OHMS at “F”.
NOTE: Model 9800 materials of construction permit use in common
fuels such as gasoline, diesel, bio-diesel as well as water.
Sender Removal Warning
Should it appear necessary, for any reason, to remove a sender
from the tank, do not attempt removal unless under competent
supervision with all due precautions taken against the hazards of
escaping flammable liquid or vapor.
WARNING: mproper sender or indicator selection or application may result in inaccurate readings. Release of tank con tents as well as
damage to equipment and safety hazard may result if tank is overfilled. Fuel exhaustion may occur if tank contents are less than indicated.
MS-514 Instructions For roubleshooting
Rochester 9800 Series Fuel Level Senders
CAU ION: Fuel level senders may be damaged and ndicators
may be damaged if 12 volt wire touches the sender terminal or if
sender wire touches GN terminal or level indicator. Voltage to
energize the sender must come through the indicator from the
terminal marked SEND, SNDR, or S.
WARNING: These instructions were prepared to assist tradesmen and others generally familiar with this type of equipment. Consumers may
not be qualified to perform installations. f you have any questions about these procedures, please contact Rochester Gauges for assistance.
There are several different styles of sending units. The differences are both external and internal. Be sure you have the correct replacement
part number before installation.
NOTE:
Materials and specifications are subject to change with out notice.
05/10/2016
Fuel Level
Indicator Reading
(At Panel)
Possible Cause
No Indication
(Pointer does not move
when power is turned on)
1. Empty fuel tank.
2. No voltage to indicator because of bro-
ken or disconnected wire or open fuse.
3. ndicator not grounded.
4. ndicator defective.
Erratic Reading 1. Loose connection.
2. Defective sender.
Inaccurate Reading 1. Defective sender.
2. ndicator incompatible with sender.
10 to 180 OHM or 0 to 90 OHM Systems & Others
With Low Resistance At Empty
Indicator reads
FULL at all times
1. Wire from sender broken.
2. Sender not properly grounded.
3. Defective sender.
Indicator reads
EMP Y at all times
Connection between sender &
indicator shorted to ground.
240 to 30 OHM Systems & Others
With High Resistance At Empty
Indicator reads
EMP Y at all times
1. Wire from sender broken.
2. Sender not properly grounded.
3. Defective sender.
Indicator reads
FULL at all times
Connection between sender &
indicator shorted to ground.
