Question about 2000 Pontiac Grand Prix

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Fuel gauge doesnt read correctly?

Fuel gauge is incorrect. I was told bad ground on the sending unit could cause this, where exactly can i locate the ground mentioned?

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  • Anonymous Mar 13, 2014

    Gauge incorrect

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  • Pontiac Master
  • 6,674 Answers

You'll have to go back & try to look up on top of tank where the fuel lines etc., attach to pump & sending unit assy. Will be a single wire or strap connected usually on ring around sending unit area.

Posted on Nov 29, 2008

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Related Questions:

1 Answer

My fuel gauge read empty even with a full tank of gas


Probable causes:

  1. Wire from dash gauge to sending unit is broken or the connection is corroded hindering electrical connection.
  2. Resistance wire inside sending unit is broken
  3. Lack of proper grounding between sending unit and tank or between tank and chassis
Narrow the cause by testing. At the bottom on the following webpage you will find testing procedures as well as repair. (It is always helpful to mention brand and model and year).
Fuel Gauge Testing

Aug 27, 2017 | Cars & Trucks

1 Answer

What's your question?fuel pump working but gauge nt working wts can be the cause.


Either the gauge itself, or the wire from gauge to tank, or the sending unit in the tank. Most of the time it is a problem with the sending unit.

They work like this: in the instrument cluster, a small voltage regulator sends low voltage through the gauge, into the wire to tank, and to the sending unit. The unit has a variable resistor that varies according to the fuel level, measured by the float arm attached to the unit. What it (the gauge) actually measures is resistance to ground-the current goes to a ground point after going through the variable resistor in the sending unit.

You can check if problem is the gauge or the sending unit by grounding the fuel gauge wire at the gas tank connector. Pull the electrical connector apart and locate the fuel gauge wire. Jumper that wire to ground on the frame while watching the fuel gauge needle for movement. DO NOT ground it for more than a split second, just touch to ground while someone watches the gauge. If the gauge needle moves at all (will probably go to full or empty), then the problem is the sending unit in the tank. The gauge is good, so is the wire from gauge to tank. I should mention that doing this test can possibly blow the meter (gauges) fuse in the fuse panel- why I said to do it just for a brief moment.

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My nissan murano fuel guage does not read above E on guage even when filled


may be a bad float or the connection to that float is broken

Mar 04, 2015 | Nissan Cars & Trucks

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I have a 2007 Chrysler Pacifica with 63,000 miles. It was a 1 owner (prior to me) & was well take care of with regular maintenance. The gas gauge will Not go above the 1/2 mark when filled completely full....


I do not own a pacifica but I do know quite a bit about cars and the digital read out gets in info from the gas gauge. so if the gas gauge is incorrect so will be the read out. I would start at the sending unit for the fuel gauge I bet you will find your problem there. The sending unit is most likely located in the gas tank

Feb 24, 2015 | 2007 Chrysler Pacifica

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2000 Dakota quad cab fuel gauge wont work, jumps to full when started, fuel pump has been replaced. What next?


Check for a frayed wire touching metal and grounding out. The gauge works on resistance and it registering full indicates a short to ground. Either that or your gauge itself is bad.

Sep 01, 2014 | 2000 Dodge Dakota Quad Cab

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Put in new fuel pump and sending unit. but my gas gauge doesnt always work. sometimes is does and sometimes it doesnt


if it worked for a short period of time after doing the pump/sending unit the check the connections going to the pump/sending unit they would have been moved around doing the pump

Aug 11, 2012 | Cars & Trucks

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I have a 2003 GMC Envoy and my gas gauge has been flowing up and down to empty and full recently it has stayed on empty. How do I fix it?


Ensure that all of the wire connections are clean, secure and corrosion-free.

  • 2 Check your fuel gauge fuse if the gauge's indicator stays on empty when your turn on the ignition. If the fuse is good, join the sending unit connector to ground. Replace the sending unit if the gauge indictor moves to the full line.
  • 3 Ground the terminal located on the back of the fuel gauge with a jumper wire if the indicator doesn't move. If it does move, consider replacing the wire between the fuel gauge and the sending unit. A poor ground is frequently responsible for fuel gauge problems.
  • 4 Release the wire that connects to the fuel tank's sending unit. Confirm that there's no worn insulation that would permit wire contact to the body or frame. A fuel gauge reading of full generally indicates a problem with the tank unit, not the wiring.
  • Oct 18, 2011 | 2003 GMC Envoy

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    My 2006 cadillac fuel gauge suddenly stopped working and is stuck on empty any suggestions?


    drop tank change sending unit,check for bad ground,bad gauge,most likely its sending unit bad

    Jul 21, 2011 | 2006 Cadillac STS

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    My fuel gage keeps going from empty to full while im driving


    The Fuel SENDING UNIT HAS FAILED And IS CAUSING This Fluxuation Of the GAGE, The Sending Unit Is Located IN the FUEL TANK & Requires TANK REMOVAL to Replace it,
    NOTE;;;; IF YOU HAVE HAD THE FUEL PUMP REPLACED RECENTLY, THEN 99% PROBABILITY THAT THE INSTALLER WAS NOT VERY GENTEL WITH IT, THIS IS A COMMON REASON FOR THIS TYPE OF FAILURE.

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