Question about 2000 Pontiac Grand Prix

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We have a 2000 Pontiac Grand Prix. The fuel gauge will not drop below a 1/4 of a tank. You can run out of gas and the gauge still shows 1/4 of a tank. Could this be the sending unit and how do you get to it?

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I think there is a access panel behind rear passenger seat to get to the fuel pump/sending unit

Posted on Oct 13, 2010

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My gas gauge fluctuates on my 2004 Pontiac Grand Prix why??


Its because there is a problem in your care fuel meter.Visit the nearest workshop and show it to an automobile specialist.Manual repairing is not possible unless you are a automobile specialist.
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Do I have to remove the gas tank to inspect/change the fuel pump on a 1991 pontiac grand prix?


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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

I have a 2000 Grand Prix SE and car specs say that it has a 68 liter gas tank. I converted that into gallons, and its about 17.8 gallons. when i refueled, the gas pump only said it put in 12 gallons when...


make sure you fuel tank float isn't becoming saturated with gasoline. If the gauge reads full when it is indeed full, you probably don't have a short in the wire that goes to your fuel float sending unit. If that wire is bare and shorts out it will say you tank is empty since it works on resistance open or unplugged the gauge would read full, closed is or going to ground the gauge will read empty. I would think the float might be bad or the float arm got stuck down when you turned a sharp corner. I had one of these cars but I don't remember exactly where the fuel level sending unit is located and if you need to remove the fuel tank to gain access to the sending unit. I hope this helps you

Mar 09, 2010 | 2000 Pontiac Grand Prix

1 Answer

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should be a grey wire going to the top of fuel tank connects to fuel guage / when the guage in the tank reads grounded it shows full , no ground it shows empty. if you ground that grey wire and the guage jumps to full then faulty guage if nothing maybe bad ground on the tank itself. the guages are a reostat like a tyco race car gun the more it moves the more it grounds .. good luck

Nov 19, 2009 | 2000 Pontiac Grand Prix

1 Answer

1997 Pontiac Grand Prixn feul gauge is backwards


Hello - you will need to replace your sending unit - which is attached to the fuel pump in the gas tank.



Thanks for using FixYa!

Oct 28, 2009 | 1997 Pontiac Grand Prix

1 Answer

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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

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Once the fuel gage on my 1997 Grand Prix get below 1/2 a tank, the gauge will raise to show nearly 3/4 of a tank of gas. Is this a problem with electronics or the sending unit???


Either the sending unit on the tank, or there is a short in the wire going to it.. check it for a worn spot in the wire from the fuel tank that is usually the problem .

May 01, 2009 | 1997 Pontiac Grand Prix

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