Question about 1994 Pontiac Grand Prix

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Fuel gauge not working. Stuck on Full position

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Look under the tank on your car hand ther is a sancer on it thees do get bolckt

Posted on Mar 30, 2011

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You can try gently tapping on the gas guage with your finger,sometimes dust or debris make them stick. otherwise i suggest you have a bad fuel sending unit on the gas pump itself.unfourtunatlly you can't just buy the sending unit,it comes with the fuel pump.the fuel pumps located inside of the fuel tank under the car which means it will have to be removed to replace the whole unit.suggest you check for prices in the area for pump and labor. thank you for choosing fixya.com

Posted on Mar 30, 2011

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TOWNSEND351
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SOURCE: Fuel Gauge stuck on full reading

replace fuel pump/Fuel gage sending unit (All in one) also wire pigtail to asmbly Pontiac Montana's are prone to wire falures and shorts $300+ if done in drive way alot more if you have a shop do it!
P.S. REPLACE ASMBLY WITH AS LITTLE FUEL IN TANK AS YOU CAN...!

Posted on May 04, 2009

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1 Answer

I put fuel pump in my car now my fuel gauge to stuck on full how can I fix it without taken tank my out


The float for the fuel gauge is part of the fuel pump assembly - it was probably damaged or is stuck in a position where the float cannot move freely. If you had to remove your tank to replace the fuel pump, you will have to remove your tank to correct this problem.

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I have a 1992 Mercury Grand Marquis Ls with a fuel gauge that does not work (gauge may be reversed)??? help please.


The fuel level indicating system is a magnetic type system, which consists of the sending unit located in the fuel tank, an anti-slosh module located on the back of the instrument cluster, and a fuel gauge located in the instrument cluster. The sending unit changes resistance according to the level of fuel in the fuel tank, which varies the current flow through the gauge.The pointer position varies proportionately to the current flow. In this system, the sending unit resistance is low (22 ohms) when the fuel level is low and high( 145 ohms) when the fuel level is high. The pointer of the magnetic gauge remains in position when the ignition is turned to the Off position. On some models, an anti-slosh module is used to dampen out fluctuating fuel signals from the sender. Some vehicles are equipped with a low fuel warning indicator. The anti-slosh module will also actuate the low fuel indicator when the fuel level in the tank reaches 1/16 to 1/8 full.


Do your other gauges/warning indicators work properly with the ignition on? If not, check for power at the fuse panel/fuses.

If they do then partially remove your cluster with connector still installed and check for voltage at cluster connector and gauge. Check continuity of cluster and gauge for ground.

Sometimes the anti-slosh module (if installed) goes bad in the Grand Marquis but not likely.

Sender troubleshooting:
  1. Perform test with resistors as follows:
    1. Disconnect wiring connector at sender unit, then connect resistor between gauge lead and a suitable ground.
    2. Turn ignition switch to On position.
    3. With 145 ohm resistor, the gauge pointer should contact the Full mark.
    4. With 22 ohm resistor, the gauge pointer should contact the Empty mark.
  1. Perform test with fuel sender of known quality as follows:
    1. Turn ignition to Off position.
    2. Disconnect wiring connector from sender and connect it to test sender.
    3. Move float rod away from fuel filter against Full stop position. Wait approximately 30 seconds, then turn ignition switch to On position. The gauge should read on or above the Full mark.
    4. Move float rod toward fuel filter against Empty stop position. Turn ignition switch to Off position. Wait approximately 30 seconds, then turn ignition switch to On position. The gauge should read on or below the Empty mark. If gauge works properly replace sender, which involves dropping fuel tank.

Mar 23, 2013 | 1992 Mercury Grand Marquis

1 Answer

Fuel gauge stuck on full,why. 1986 chevy caprice classic


You have fuel position indicator on the fuel pump. To fix it, you'll need to replace the pump.
Try knocking on your fuel tank (around the location of the fuel pump) with a mallet, sometimes this works.

Jan 23, 2011 | Chevrolet Caprice Classic Cars & Trucks

1 Answer

99 mustang fuel gage stuck on half, low fuel light works


If the gauge remains in one position, on or off, full or empty, then it may be a bad gauge, or a faulty voltage regulator for the gauge. If the instrument panel is removed, there is a printed circuit on the back which ties to all gauges and lights. Check it for breaks or corrosion. The voltage regulator should be mounted to the same area and supplies regulated voltage to the fuel gauge. Hope this helps!

Sep 19, 2010 | 2000 Ford Mustang

1 Answer

1995 Honda Civic fuel gauge stuck onfull.


the fuel level sensor in the gas tank needs to be replaced easy way is a new fuel pump assembly

Oct 19, 2009 | 1995 Honda Civic

1 Answer

Jaguar fuel gauge problems


sounds like you got the float stuck when you installed the new part, have seen this hapeen often

Sep 14, 2009 | 1992 Jaguar XJ6

2 Answers

Fuel gauge stuck on full for my 2000 ford taurus SE


it is probbally the fuel pump in the gas tank. It has a float like the one in your toilet and a sensor attached to it to tell you how much gas you have.

Aug 08, 2009 | 2000 Ford Taurus

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