i just bought a 96 suburban about a week ago. i noticed the gas tank was almost on the red last night so i stopped for the dreaded full tank fillup. i have the original sticker and it said i should have a 42 gallon tank, however i only put 19.996 gallons in, and that was after pulling the lever again and letting it click off again automatically. after that, the needle only registered 3/4 full. im thinking that the sender is faulty and the tank just isnt registering the entire tank of gas. is it possible that the tank is not really 42 gallons? as much as i dreaded the $100 fillup, i wanted the tank cause i'll only have to fill up like every other month(i dont drive a ton). i also realize that the sender could also be the reason that it registered empty, even when it might not have been. the other option is that maybe the needle on the dash needs recalibrated. anyway to do that?