My fuel guage doen't work. It reads way above full and I know the tank is almost empty. I wasn't sure if I should pull the tank to check the sender or not. I know it's a pretty big job and didn't want to do that if it's not necessary. I checked with a GM parts dealer and the sending unit is around $450 so I don't want to replace it if it's not bad. Anybody have any other ideas? Rob.