Question about 2000 Pontiac Montana

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Fuel guage Fuel gauge not working properly. I was told there is a module behind the front drivers seat under the carpet. what does it do and what do you call it.

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  • 8 Answers

The module is in your fuel tank hooked onto your fuel pump. Its a common GM problem.

Posted on Jan 07, 2013


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Posted on Jan 02, 2017

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SOURCE: gas gauge not working property

Pontiac has a problem with the sender for the fuel guage. A quart of transmission fluid in a full tank of gas usually fixes it. The "engine" light, won't be on because of that. Quite often that is the air filter or fuel cap.

Posted on Jan 02, 2009

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SOURCE: Carpet wet behind driver seat

look for rust holes, missing drain plugs, in the floor pan, under the car, spray when driving also comes up off the road and tires, there are a number of points of entry, seat mounnts transmission mounts
not really a solution, just something to check

Posted on Oct 13, 2008

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SOURCE: fuel gauge inaccurate 2002 Pontiac Bonnyville

this problem is caused by the sending unit inside the fuel tank, very common problem.

Posted on Feb 15, 2009

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SOURCE: I have a 2001 Pontiac

I have neevr heard of that problem. Get access to the wires going to the gas tank and unplug the unit. See if the problem is still there.

Posted on May 29, 2011

  • 1 Answer

SOURCE: wiring diagram for fuel guage on 97 grand prix

Did you check the fuel pump?
If you did, check for a grounded wire somewere by the pump.

Posted on Sep 18, 2012

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Are you serious ? :)
Next to your driver seat there's a little handle to open the fuel door.

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Fuel pump driver module

Look into the rear of the trunk behind the driver-side rear-passenger seat and pull back the carpeting. Locate a black, rectangular box that has a wiring harness plugged into the bottom of it. This is the fuel pump driver module.

  • Unbolt the module by loosening the two bolts holding it in place with a socket wrench. Disconnect the wires at the bottom of the module by simply squeezing the locking tabs on the wires and disengaging them from the module.

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    2003 Montana-fuel guage always reads full. Unable to refill tank when low on fuel.

    This is caused by a bad sending unit in the fuel tank, I have seen this many times and a new fuel sender fixes these every time.

    This is very common in montanas... a
    lso for the fuel gauge (I believe its applicable for a 2000 and later), it may be an issue with the C-305 connector.

    Its a pass-thru connection for wiring (from inside cabin to outside/underneath). It connects various wires for things in rear of vehicle(including connection to fuel pump/sensor). While its weatherproof on bottom (underneath) it is not inside cabin, spills/ various leaks inside can cause water intrusion and subsequent corrosion of wires.

    The connector should be under carpet to the rear of drivers seat (you may be able to see exactly where by looking under vehicle for a bundle of wires that come out from cabin)

    Hope helps.

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    Gas gauge not working property

    Pontiac has a problem with the sender for the fuel guage. A quart of transmission fluid in a full tank of gas usually fixes it. The "engine" light, won't be on because of that. Quite often that is the air filter or fuel cap.

    Oct 01, 2008 | 2004 Pontiac Montana

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