My fuel gauge STAYS in the full level. Ive noticed the only time the needle moves is when I'm a couple of blocks driving distance of running out of fuel. Which is a lil bit under the red line. But once I pump ANY amount of fuel it goes straight to Full. I have no idea what I need to replace or fix...

 

on the back of the fuel gauge there is a chip. replace it and it should fix your problem.

 

Oh ok. Ill try that this weekend. Thanx dude.

 

If only the fuel gauge is acting up, its the sending unit.

But if the temp.,oil pressure, and fuel do the same, then its the slosh module in back of the cluster.

I had the same problem, and it was the fuel level sending unit that fixed it.
Hope this helps.