your ingition switch might not be shuttign off completely thus leaving your pump on... hell thats the only thing I can think of but I know very little about cars so that may not be it
97 Mystquie GS - I4 ATX died at 168K
94 Pontiac Crap AM SE - 2.3L I4 5spd
2002 Mazda Protege5 - 2.0L ATX