[J-Mech]

Hey grandprix thats funny LOL! Oldbills, there is a ball in the end of the filler neck about the size of a ping-pong ball that prevents people from siphoning gas out of the tank it may be stuck. I'm not sure if you can get to it without pulling the tank. Is the tank in center or rear? If you can get under the car look and see if you can see the fill hose. If you can pull it off the check valve may be in the line or it could be in the top of the tank at the hose connection. Good luck!!!