What might cause a gas smell?

Here are a few causes of fuel odor, regardless of the year or make of the car or truck: * leak in fuel feed or vent line. * tank overfilled! * Evaporative emissions system canister clogged. * vapor leaks from system lines. fuel presure regulator, if this does not operate correctly it dumps too much gas into your engine!! http://www.autozone.com/servlet/UiBroker?UseCase=S001&UserAction=viewSimpleDiagInfo&Parameters=info