My brother came over tonight and he said that my gas cap was off, i went out side, and sure enouch, the motherfcking gas door was open and lid hanging there by that string thing. What could have happened, haven't started car or done anything except put it back on. Do you think someone syphined the gas out or put sugar in?? What does sugar do to it anyways? I'm pissed if somethings wrong with my car. Can't tell if anything else is wrong, its too dark out.