Most likely you have a leaking injector, (dripping in the cylinder after you shut it off) also could be a fuel pressure regulator with a ruptured diaphragm witch will push fuel through the vacuum hoses ect into the intake and wash down the inside of the motor, pull the vacuum line off the regulator and check for fuel, if fuel is present replace the regulator.
I cant stress enough to be careful, if the engine is full of fuel you will need to change the oil and filter, make sure the exhaust pipe is not full of fuel, if so jack it up as to let it drain out,or ventilate it by removing the pipe and blowing air through it, I would park the car outside before attempting to start it and have a extinguisher on hand just in case, also make sure the air cleaner housing is not full of fuel and the paper soaked if so replace and dry out the box, disconnect the ignition system,fuel pump and remove the plugs, roll over by hand as to purge any fuel from cylinders, after that apply the fuel pump and check for fuel in the cylinders again (due to a dripping injector) then disable pump and roll over by hand again, if fuel comes out of a certain cylinder then remove all injectors and have them tested, serviced cleaned and/or replaced.
just make sure you don't arc any sparks around the vehicle until it is totally ventilated (hence the reason for rolling over by hand as to not arc the starter and go boom!) also if the system has a cold start fuel injector that could be the culprit as well, test the same as the injectors.
be safe!
nice answer, NOT