The fuel gauge on my 2003 gp is acting really weird. Some times it shows what I think is the right measurement but usually it'* way off and says its full when I have 100 miles on the tank. Also when I turn off the car it doesn't go to empty like it should it just stays where it should.

Any ideas of what this could be. Would it be the sending unit or maybe the wiring for it? Can I test it without removing it? Thanks for your help in advance!

My money is on the fuel level sender in the tank occasionally sticking.
Which I believe you may be able to replace without having to drop the tank, check for an access panel under the carpet in the trunk, if you do not have one you will have to drop the tank to replace it.

This might help...

https://www.gmforum.com/mechanical-1...-guide-289937/

The fuel level sender is part of the fuel pump assembly. There are two brass contacts on the pivot point for the float arm that detects fuel level, and they slide across a grid of PCB contacts to vary resistance, thereby letting the car know how much gas you have. The contact points on the float arm are subject to degradation, and when they start to wear you start to get inconsistent fuel level readings. The link Mike provided shows you how to change the float arm pivot component that has the two brass contact fingers on it. This should make you problem go away. In the meantime, figure out how many miles you can go on a full tank of gas, subtract 50 miles, and every time you hit that mileage on the trip recorder fill the tank and reset the trip recorder.

Thanks guys, one last thing, I couldnt find just the part you replaced instead i found this More Information for DORMAN 911008 does this have that part i am going to need? Where can I buy just that part?

When I fixed mine I purchased only the component you need from Dan at Tri Star Radiator. If I had to do it over again I would probably buy what you are looking at from Rock Auto.

Rebuilt Fuel Sending Unit Specialist

yeah i was thinking its probably the better thing to do.

Thanks everyone for your help!