Question about 2001 GMC Jimmy

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My fuel level guage will fluctuate when the key is in the on position and sometimes while at an idle. It goes from full to empty a few times then settles back to the correct fuel level.

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  • Expert
  • 54 Answers

There is a short somewhere

Posted on Oct 13, 2013

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  • 2 Answers

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Posted on Jan 02, 2017

SOURCE: fuel gauge reads empty after fillup and low fuel

common problem with those trucks, it turns out to be a bad fuel level sender/module its located in the fuel tank. drop the tank, replace the sender and re-install tank. simple procedure if you know what your doing.

Posted on Aug 17, 2009

omaromid
  • 332 Answers

SOURCE: Low fuel light On

The problem is with the fuel level sensor, it's attached with the fuel pump and located inside the fuel tank, sometimes the water and other impurities inside the fuel causes this problem, solution is to get the fuel pump opened by a professional and the problem might be solved by some simple cleanup. Hope it helps and comment if you need more advice. Please don't forget to rate the answer, it helps me, thanks!

Posted on Mar 29, 2010

  • 432 Answers

SOURCE: My gas guage is not holding actual fuel level

Typical gm problem, the float assembly or a ground wire, Ive always run across it being the float which can be bought through the dealer seperately than the whole pump w float assembly.

Posted on Jul 27, 2010

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SOURCE: Gas guage-oxygen sensor?

The oxygen sensor has nothing to do with the fuel gauge. There are two possibilities for the gas gauge error, first it could be the in-tank gas level sensor or it could be a defective stepper motor which drives the gauge. A professional scan tool can determine the fuel level being sent by the in-tank sensor, if that disagrees with the gauge, then the stepper motor needs replacing.

Posted on Sep 30, 2010

Mr BrokRench
  • 1623 Answers

SOURCE: My 2002 GMC Yukon Denali's fuel guage goes up

Most likely the rheostat on the float is bad. Unfortunately, this is part of the fuel pump and inside the fuel tank.

Posted on Jul 28, 2011

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1 Answer

Why does my gas gauge needle never go below 3-4 tank?


I would guess the fuel level sending unit is malfunctioning, deposits sometimes build up on the resistor pack, or there is and open circuit in the resister pack, does the fuel gauge needle do a full sweep from empty to full and back when the ignition key is turn to the run position? This is a cluster self check mode, if it fully sweeps than the cluster is ok, I would suspect it needs a fuel level sending unit which is located in the fuel tank as part of the fuel pump modual but usually can be serviced separately

Oct 25, 2014 | 1990 Buick LeSabre

1 Answer

Why fuel gauge not working gas guage on 2009 santa fe stays on empty even with a full tank of gas. Guage fluctuates from empty to 3/4 full to empty to 1/3 full at any given time.


It could be the sending unit in the tank or the gauge on the dash. A mechanic would test the signal coming from the sending unit to verify.

Jan 19, 2014 | 2009 Hyundai Santa Fe

1 Answer

My fuel guage will go from full to empty a few times while at an idle or with the key on engine off thensettle into the correct level. It happens erratically.


sounds like a loose connection somewhere could be ground connection or corrosion problem check connections and clean if that does not solve could be sending unit getting ready to fail replace as nessary

Oct 13, 2013 | 2001 GMC Jimmy

1 Answer

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 is on empty and the low fuel light is on, but the tank is full


u either have a bad level sensor in the tank or the guage is bad. u need to get wiring diagram and find connector for fuel sending unit and jump wires to trick guage into thinking it is full if it still say empty u need instrument cluster if it goes to full it level sensor in the tank

Feb 23, 2011 | 2002 Saturn VUE

1 Answer

The fuel level guage fluctuates from full to empty.


it might be the floater in your gas tank

Apr 13, 2010 | 2000 Oldsmobile Alero

1 Answer

My gas gauge works (not incredibly accurate, but works). When i stop for more than a few seconds the gauge goes to empty. when i start moving it goes back to full and slowly comes down to where the gas...


As far as the gas gauge level goes, it sounds to me like it could be the float ball system that is inside of the gas tank, which is connected to the fuel pump.I dont think your guage in the dash is broke, but i could be wrong. Sounds like something in the fuel pump area

Nov 20, 2009 | 1998 Dodge Ram 1500 4WD

2 Answers

2001 Chevy Impala gas guage incorrect


The level sensor is bad. They are easy to do. You don't have to pull the fuel tank down. There is an acsess hole in the trunk. Look in the rear of the trunk at the rear of the seats. You will notice there is a spot in the middle that the capet comes together, Pull them apart and there is metal plate with some 10mm nuts, pull that off and your fuel pump is there, remove and replace the sensor.
Also there will the a code in the pcm. you will need to clear it to pass emissions

Jun 19, 2009 | 2001 Chevrolet Impala

1 Answer

Fuel guage reads 1/4 at all times even when full. How do I repair


1.If the needle on the guage is stuck. you can try tapping the guage to see if the needle moves or turn the ignition on and off a few times to see if you can get it to move. If the guage drops to empty when you turn off the ignition you know that its not the guage. (note that the guage does not drop to zero when ignition is off with all cars of this age).

2. The problem could be with the sensor in the fuel tank itself. Rocking the vehicle up and down from the rear (you will need help doing this) may free the sensor level indicator ball in the tank.

Dec 17, 2008 | 1983 Jeep CJ7

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