2002 SLE... This just started happening on the last three or four tanks of gas... After a complete fill-up everything is normal until the fuel gage goes under 1/4. When it is under 1/4 it seems to be OK until I go around a corner - like on a country road sweeping corner at 60 MPH - or around a freeway on-ramp loop. The needle swings up to 1/2 or 3/4 and varies a little after I straighten out, then pegs at full and stays there. The miles left to empty display then shows something like 460 when just a moment ago it was showing 150, or so. If I stop and shut off the car, wait and restart, it is still pegged - and it does not do the needle swing thing even though the other gages do. If I then go to a gas station and start filling and go turn the key on while it is filling, the gage will track the filling process from about 1/4 to full - and the same scenario replays with that next tank. When I start the car after the fill-up, the needle does the swing thing and it reads normally down until 1/4 and then it freaks out again. Anyone had this issue ? Is this a bad sender unit - or going bad ? Can it be replaced from inside the trunk ? Is there an access port ? How much is a sender unit ? I don't want to try to fix it if it is bad or questionable. I would prefer to just replace it.

Take a look at this.

https://www.gmforum.com/t278816/

Wow ! You are my hero ! That is exactly my problem. I can't believe how much a new unit costs and how easy it is to just fix it with that little part. I will choose the fix it solution. I can't thank you enough. I will let you know how it worked out.

See this link for an explanation and solution for getting just the replacement tank sender part and not the whole expensive pump unit. What do you think ?

Link...

GM Level Sensor Page