My fuel Gage has stopped working....it just keeps reading full but it's not could it be a fuse or something worse? Please help I have a kids and I don't wanna get stuck somewhere with her cause of it

Asked by Feb 28, 2015 at 09:46 PM about the 1999 Pontiac Grand Prix 4 Dr GT Sedan

Question type: Maintenance & Repair

9 Answers

12,870

The fuel sending unit may have failed ... It should be an easy fix for anyone handy because the unit is accessible from the trunk ... you don't have to drop the fuel tank like in the Good Ol' Days Good luck

8 people found this helpful.
6,405

It is probably either the guage itself or the sending unit in the tank. Unitl you fix it, try using your odometer to judge the fuel level (if you know how many miles per gallon you typically get) and don't take it down below a quarter tank. Sending unit will require removing the tank so be prepared to spend a few hundred at a shop. The gauge is not a job most shops want to tackle so you would likely wind up at a dealer (and also spend a few hundred). Before doing either of these, check the fuse that controls your guages to make sure it is OK.

3 people found this helpful.
12,870

Most Grand Prix less than 20 years old have an access panel on the right side of the trunk (under the carpet)

7 people found this helpful.
80,385

If the sending unit checks out ok then it's a bad hot wire to the gauge. A fuel gauge that always reads full is a bad hot wire. If it always reads empty it's a bad ground. HTH. -Jim

6 people found this helpful.
12,870

You may be in the right Church, but the wrong pew ... the gauge should read to ground not hot. The sensing must be done through an "intrinsically safe" circuit because the presence of a spark would make a bad day ... a really bad day

4 people found this helpful.
110

What if the fuel gauge moves around... reads empty, then full randomly.

11 people found this helpful.
10

Had fuel pump replaced but gauge reads full when filled up then bounces back in forth reads low fuel 1999 grand prix dont have a clue anybody help

1 people found this helpful.
12,870

The fuel gauge works by having a little float (like the toilet has) and it works by changing the amount of voltage going to the gauge corresponding to the height or depth of the float ( It's an extremely low voltage source so no sparks are possible ... for obvious reasons) .. On your Pontiac the Fuel pump and float should be one unit that's accessed at the top of the fuel tank. If you lift the trunk carpet close to the back seat you will see an access hatch that secured by 3 bolts ,, remove the bolts and turn the cover about quarter turn Counter clock wise ,,, once the cover is off the electrical connectors must be disconnected and the fuel lines must be unlatched ,,,, the complete unit comes out the access hole

1 people found this helpful.
10

my fuel gauge stays on 3/4 whether the car is on or off but when you first turn the key it will go up a tiny bit but settles back on 3/4

1 people found this helpful.

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