My freinds girlfreind just got a 97 Cavalier, and he called me last night asking if I could look at it and find out why the gas is disapearing from the tank. My 1st thought was gas thieves since I doubt she would lock her gas cap if it is even has a lock. But he said it happend while they were at the mall Christmas shopping too. Now, i know some people are brave, but siphoning gas in a mall garage during holiday shopping? doubtful. So, my next thought was: Maybe theres a hole just big enough to let oxygen in/out and fuel vapors are leaving through this. Is that a possibility? Lastly, I thought it may be the fuel sensing units or whatever.
Please help me out here...I know quite a bit about cars, but I havent even finished my 1st year of Auto. Technology and people already want repairs... :rolleyes:

possible leak in the fuel line somewhere... running rich all the time too would cause for it to drain pretty quick...it would just dissapear that quick due to air exposure...