Oldsmobile/Buick Repair: 2000 Alero, hydro carbons, fuel leaks

Question
2000 Alero, 2.4 Liter engine.  43,000 miles.
Recently started smelling gasoline when the fan blower is turned on.  Now smell gasoline outside of vehicle in garage.  There is also a black smear on the garage floor where approximately where the muffler would be.  Carbon?

Answer
HI DALLAS,WELL TYPICALLY IF GAS ODOR IS PRESENT AND NO VISIBLE FUEL LEAKS.THE CAUSE IS NORMALLY HIGH HYDRO CARBONS.AS IN UNBURNED FUEL IN CONVERTER.THIS IS CAUSED BY A CYLINDER NOT BURNING ALL THE FUEL DISTRIBUTED TO IT.POSSIBLY A FOULED SPARK PLUG OR A RESTRICTED CONVERTER.EITHER WAY SHOULD BE CHECKED BY A TECHNICIAN.IMMEDIATELY.GOOD LUCK PLEASE VOTE FOR ME.BILLYMAC