I think most GM cars use a similar fuel level sensor. My fuel gauge went crazy a few months ago on my 1999 Buick Regal. I picked up a new fuel level sensor off of ebay for $20. It wasn't a perfect fit, but good enough. My fuel gauge is back to normal and has been working fine for a couple of months.
Some people say this repair is easy. I disagree. It took 2 tries and several hours. I call my self repair "The Minimum Wage Garage" because that's about all I'd make if I did it for a living.
I put together a web page on my site detailing the repair. Maybe this will help you out.
http://www.redhouseon7th.com/redhous...sor/index.html