93 5.7 blazer, flooding, getting too much gas

Hello. It seems there is an fuel problem with your van. A malfunctioning fuel pressure regulator and/or a cracked vacuum hose connected to that fuel pressure regulator will cause the engine to 'flood' AND run rough. Good luck and keep me informed; if you want to.

If you hold the pedal to the floor it puts the fuel system into Clear Flood Mode. This prevents the injectors from firing and lets the already present fuel burn out. Now if this has to be done on every short trip you probably have a leaking injector.

Does the vehicle seem to crank slowly or stop and then crank when this happens?

Doubt it.
Sounds more like a leaking injector or fuel pressure regulator.

I agree with Peter on this one. Sounds like low fuel pressure. First thing is to be sure that you have around 55-60 psi when you turn the key on and running should be around 55. If the pressure drops much below these no.'s the fuel pump may need to be changed. Don't forget to check and/or change the fuel filter also.

If/when you do get it started, do you have to hold the petal to the floor or give it a lot of gas to 'clear' it up again? Does it smoke when you first start it up? If so, you might have a leaking injector (s), the o-rings allow pressure to push gas into cylinders when you shut down, flooding the cylinder-will cause hard starting. If this is not the case, consider a heat-sink kind of situation with the crank sensor-it gets hot with normal driving, and gets even hotter with heat-soak when shut down and changes electrical properties (specifically resistance) until it cools down again. change the crank sensor.

tps throttle position sensor to test first

Pull your vacuum line off your fuel pressure regulator and see if it smells like gas in line or if gas runs out of the line.

Have someone turn the key on while you watch the injectors. If any gas leaks out of the injectors, without cranking on it) replace the o'rings around the injectors.

The 93-94-95 all have this problem ..the fuel line that come into the back do split and leak ..other problem is with vaccum lines coming off the back of intake and vacuum lines come apart from a 3 way fitting.located fire wall .when these are off will cause gas smell and bad millage .... hopes this helps...

i would say you probably guessed right and also check the air filter wires rotor bug and cap on the distributor unless its coil pack ign