Got a 2009 2500 silverado diesel 6.6 fuel gauge is pegged on empty and the low fuel light comes on but the tank is full, never had any problems with fuel gauge before any suggestions for troubleshooting. Thanks

Sounds like the typical sending unit failure. The fingers on the level sensor wear out and actually cause an open circuit. Then your fuel gauge defaults to empty. Common on GM platforms.

Thanks for the info Mike, really surprised how it just quit, sitting in the driveway looks like a fun job to replace the sensor also as I have a cab on the back and the truck has a full tank of fuel,guess i need to run it down as far as I can, to much work to remove the cab and bed to get to it ,,,,,Damn I was hoping maybe a fuse or a ground wire.

Most of the time, you can unbolt the bed and slide it back some. Or, like I did, I cut a hole in my bed just above the sending unit. Then just silicon-ed it back in because I have a bed liner.

That would be nice if I had a bed liner but I don't, quick question what brand sending unit did you replace it with? and how well is it holding up .....

Stay away from Airtex and anything cheaper than Delphi or AC Delco. Seriously, you get what you pay for. I've seen some Airtex pumps fail right out of the box. I put a Delphi in my S10 a few weeks ago.

Thanks Mike, I was looking at ac delco just wondering if im getting the same headache again, but I think I agree with you I like delco and delphi I don't mind spending the money for a quality part. Now I just got to find the time to do it and pull the fiberglass cap off the back then lift the bed. Thanks for the help,hopefully this will be better than i'm thinking.

Run it around a while and see if your fuel gauge comes back. I've had a few GMs just burn out one end of the level sensor, so you might be able to see your level further down. Then you can help yourself out and run your tank down close to empty before trying to work on it. If it doesn't come back remember it'* possible you have an issue in the wiring, so be sure to test the old sensor before you change it and put it all back together.

Its always recommended not to run fuel level down below pump level/sensor level. It keeps the pump cool and the level sensor lubricated. Constant dryness at the sensor causes it to wear out prematurely.

Thanks Mike, I will remember that. I usually don't drop below 1/4 tank before refueling i'm not sure where the sensor level starts and stops at but that is something to check out for sure, I'm also thinking this might be a good time to do a lift pump, any advice on that. Thanks