Question about 2000 Pontiac Grand Prix

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Gas gauge on a 2000 grand prix

The sender and receiver modules both tested good by local dealer. They now think problem could be in wiring.

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I have a 2000 grand prix and had the same problem. I got it tested and everything tested fine. Then someone told me to replace the gas cap. I replaced it for about $10 and it worked. Might want to start there before you put too much money into it.

Posted on Sep 09, 2008

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Hi there they are probably right if it was me i would have someone watch the guage(with the ignition on) and just start gigling wires under the dash and behind the instrument cluster

Posted on Aug 30, 2008

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Where is the anti slosh module in a 1988 mercury grand Marquis ?


Anti slosh module? I've never heard of that. If there is such a thing, it must be on the fuel level sending unit in the tank. It is usually the sending unit at fault when the gas gauge stops working.

Here's how to check if the problem is the sending unit or the gauge in the cluster: you will need a helper to watch the gas gauge needle. Pull the electrical connector apart at the tank, find the gas gauge wire. The power wire for the fuel pump is pink and black, and the ground for it is a black wire, so the fuel sender wire should be a different color. When you figure out which wire is for the gas gauge, turn the key to on, and take a jumper wire and ground the gas gauge wire to the frame. Have a helper watch the gas gauge needle when you ground the wire: the needle should move perceptibly. If it does, the gauge in the cluster is good, and the problem is with the sending unit in the tank. If grounding the wire does not make the needle jump, the problem may be the gauge in the cluster. Be sure that you have made a good contact with ground with the jumper wire.
There is a small match box size voltage regulator on the back of the cluster. This sends low voltage (about 5 volts) through the gas gauge and on to the wire going to the tank. When you ground this wire, it should cause the gauge needle to go either to full or to empty, but you should see the needle move. Remember, key on, then ground the wire. Any movement of the needle means the gas gauge is probably good, and the problem is the sending unit in the tank.

Oct 24, 2014 | 1988 Mercury Grand Marquis

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

Gas gauge goes up to full and after a bit, down to total empty. What is causing it to do that?


Hello hawky 32: My name is Roger and I will help with your answer. The most likely culprit is the fuel sender unit in the fuel tank. This is replicable but requires the removal of the fuel tank in order to replace the unit. Also when the fuel pump module is replaced you will also have a new sender unit with the pump. You might want to investigate the cost of the sender for the fuel Gage verses the fuel pump module. The fuel pump unit you can buy at the parts store. The sender unit is most likely a dealer item only. Should you need further help please just ask. Please rate the answer. Thank You for using Fix Ya. Roger

May 31, 2011 | 2002 Pontiac Grand Prix

1 Answer

Faulty gas gauge


Most of the time its is the sending unit in the fuel tank. The test for it is to use a variable resistor that is hooked up to the wiring at the fuel tank and watch the fuel gauge if the gauge works ok thats makes 100% sure its the sending unit. At 245 ohms the gauge should read full, 180 ohms for 3/4 full, 160 ohms for 1/2 tank, 100 ohms for 1/4 tank and 42 ohms for empty. The color of wires at the fuel tank is purple wire and black wire. You can also use fixed value resisters. If the fuel gauge the wires from the sending unit to computer then to gauge for bad connections, shorts, broken wire and bad grounds. If the wires test ok that only leaves insterrment cluster or computer which even most dealers can't test eather one but the insterment cluster would be a more common problem then the computer. But about 95% of the time it will be the fuel level sensor in the gas tank that causes the problem. Good luck.

Jan 08, 2011 | 2000 Pontiac Grand Prix

2 Answers

Rpm gauge dropping to zero while cruising in car


My Grand Prix Pontiac 2000 stops for no reason. Have had the mechanic do a diagnosis test but couldn't find anything. Any help would do.

Apr 22, 2010 | 2000 Pontiac Grand Prix

1 Answer

Incorrect fuel gauge reading or no reading


While it could be a bad gauge, as it's an electric gauge, most likely it's the sending unit inside the gas tank. Make sure your fuses are good, and your ground wires are clean and tight, especially under the car. If all that checks out, you might want to drop the gas tank and pull out the sending unit.

Jul 31, 2009 | 2000 Pontiac Grand Prix

1 Answer

Fuel gauge erratic


Yes the tank has to come out. It really doesn't require any special tools. You should have everything you need at the ag dealer. Try to get as much fuel out of the tank before you start so it is easier to work with.

Jan 07, 2009 | 2005 Pontiac Grand Prix

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