doyleq

Ok, I have changed the fuel pump, then the starter and found gas in cylinders. Dry-fired and it started for a second and then seemed to lock up again. There was obviously gas in the oil which I have changed and with no chunks in it. Let sit lastnight and woke up to find fuel in oil again. Any suggestions? Could it be the fuel pressure regulator? Is there any possible way to check regulator with car not running or do I just replace? Any help I can get would be appreciated. Hopefully not bent rod or has hydro'd engine.

oldalaskaman

pull the vacum hose to it and see if there's fuel in it also, you may have another issue also such as an injector not holding pressure and releasing fuel into the engine.

John A. Marker

With fuel going into the oil, you have fuel passing thru the injectors into the cylinders. My bet is on injectors. The injectors should hold the fuel back without the engine running. If you find fuel in the vacuum line going to the regulator that means the diaphragm is broken and you will not be getting accurate pressure to the injectors. Even with a bad FPR you should not be getting fuel into the cylinders.

oldalaskaman

Thank you for chiming in on this, I've read your posts and you are an excellent mechanic, respectfully, bob

doyleq

One of the questions i have is ....is this normal for all to go wrong at once? It began with a dead battery that i jump started- went to replacing the fuel pump then the starter and then found fuel in the cylinders. Now probably the injectors. Is this the normal sequence of parts to go bad? Finally, how exactly should i check the injectors to see if they are bad especially since the car will not run only turnover. Any help will be greatly appreciated.

oldalaskaman

no , not normal , but it happens, check your injectors resistance with a multi meter. that may give an indication of which one isnt holding

oldalaskaman

you need to
1. post the year of your vette
2.quit throwing parts at it and start doing diagnostic( thats what this forum is for)
3.plan on replacing 'all' injectors, if you're doing that much work do it right
4. while you have it apart , if you have one, replace the egr and put a new diaphram in the fuel regulator, replace all gaskets and o-rings with new. My personal favorite for these parts is Jon at FIC a vender on here, good parts, excellent service. but wherever you get them do everything, you dont want to do it again very soon.
hope this helps

gmboileau

I had a leaking FP regulator on my Ford van. It has a very similar set-up to the L98 corvette in terms of fuel pump, regulator, injectors..... different looking parts same concept.

The FPR diaphragm had ruptured and because of the vacuum hose on the regulator it literally sucked enough fuel into the engine to hydro-lock it through the vacuum line and down the rear of the intake manifold.

I removed the plugs and turned it over and fuel came spewing out of the spark plug hole of the cylinder closest to the FRP. There was a lot of gas. I still thank my lucky stars that I didn't have a fire. As well there was fuel in the oil.

If your regulator is damaged it should be easy to see by removing the vacuum line and then turning key to the run position to let the fuel pump run for a couple of seconds. Do this a couple of times ....if you see fuel at the end of regulator vacuum connection there's your problem. If it's dry... as the others have suggested ..look closely at the injectors