Modern cars actually have flaps and barriers inside the filler hose. This is actually to prevent people from stealing your gas! I have not had success with most newer vehicles trying to do this. You may be able to access the filler hose closer to the tank, remove it, and try again. Otherwise you would have to drop the fuel tank, or if you're junking the vehicle punch a hole in the tank (don't drill a hole or you could start on fire because of the sparks inside a drill!!).