When starting the engine, if you floor the gas pedal, the ECM goes into the 'clear flood' mode and the fuel to the motor is shut off. I seem to remember checking this feature out and found out that the fuel will be reinstated if you press the gas pedal to far. It seems that this feature worked best at something like 3/4 throttle. If you want to prime the engine a little before starting, just disconnect that famous orange wire by the battery to be safe.
Wayne