nate00

i have a '99 cherokee we are trying to get running. it seems to be getting too much fuel. lets just say it gets so much that it "hydrolocks" with fuel and wont turn over until you pull the plugs. the engine ran perfect when we pulled it from the doner jeep. now in its new body its not happy haha. any idea? we are running out of em

tjwalker

If you are getting that much fuel, then the pressure regulator on the fuel pump assembly is a suspect.

As this is an engine you swapped in from a different vehicle, it may have been running fine with the fuel pump in the donor vehicle, but the new vehicle uses a different fuel pump assembly unless you swapped that too.

And that is what I would suspect first. A gauge could help you verify. You should have 49 psi, plus or minus 5 psi. You can test it even if the engine doesn't run.

fishtaconc

Injectors stuck open? Are all the cylinders "hydrolocking"? Regardless an oil change is definately needed if that much fuel is in there... I had 2 injectors stick open on my stroker, didn't "hydrolock", just washed the cylinders down, failure followed.

fishtaconc

I didnt ask if it came from a 96+ donor, what year donor?

freegdr

did you change anything on the donor motor b4 putting it in?

nate00

the donor was my 89 comanche which had a stroker in it. we swapped over everything off the blown '99 engine onto the stroker before install.

JeepDeep

X2 on fuel pressure regulator. When they go they leak tons of fuel into the vacuum line basically flooding the engine. Pull the Vac line at the manifold and turn the key. Fuel will spray out if that's the case.

nate00

will try that in the morning. thanks