Oldsmobile/Buick Repair: Fuel Guage, fuel level sender, gm dealership

Question
I have a 2000 Buick Regal GSE and the guage floats, i was just wondering what causes that.  I put 50 dollars in it the other day and it read full even though i knew it wasn't not its down twards a quarter. but the guage moves back and fourh between 1/4 and 1/2.  
It has a Supercharges 3.8L in it with 137000 miles.


Answer
Hi
It is a faulty In tank fuel level sender unit (PROBABALLY).
The symptoms you describe sound like it.
The part is avalible from your local GM dealership and this
particular vehicle, the part can be changed by accessing the fuel pump/tank unit through the trunk.
I hope this helps
Good Luck
Pawl