99 sierra-gas guage problems

I've been having trouble with my gas guage for the better part of a year now. At first, it seemed like the needle was sticking, but now I think it's something else. Possibly the sending unit in the tank? I'm wondering if any of you have had this problem and found the culprit? I'd hate to start spending time and money with no results. I've got a 99 stepside z71 with close to 100k on it, and fear it's gonna start nickle and diming me soon... Any advise is welcome, thanks.

you need a new fuel pump assembly
here are two posts from chevy silverado forum
basicly same truck so you can search that forum too
http://www.automotiveforums.com/vbulletin/showthread.php?t=195851&highlight=gas+gage
http://www.automotiveforums.com/vbulletin/showthread.php?t=236771&highlight=Fuel+Gauge

You're right of course, the silverado is the same as the sierra, I don't know why I didn't look there before asking. Thank you for linking to those threads.

your welcome

sometimes you can't see whats right in front of you, one of lifes little mysteries.