89 grand prix 2.8l.when i turn the key it wont turn over and i noticed gas on the ground. come to find out its coming out of the throttle body. seems like all the injectors are pumping fuel at once.
a vacuum controlled fuel pressure regulator has a vacuum hose and a diaphragm is inside to regulate. if diaphragm splits it sends fuel down the hose to intake. excessive fuel will block piston, you cannot compress a liquid
Once you get the gas out of the cylinders you'll need to replace the spark plugs. They're gas fouled now. HTH. -Jim
so the regulator is probably bad?
the amount of gas that came out was unbelievable. i opened the throttle body and it poored out
Either the regulator is bad or you've got a fuel injector(s) that's stuck open and allowing gas to just pour out when the fuel pump comes on. Also pull the vacuum line for the EVAP system at the intake. If the purge valve is stuck open that'll pull gas up into the intake as well. HTH. -Jim
Looking for a Used Grand Prix in your area?
CarGurus has 2,938 nationwide Grand Prix listings starting at $879.
Search Pontiac Grand Prix Questions
Pontiac Grand Prix Experts