Fuel Pressure Regulator? Help!!
Thread Starter
4th Gear
Joined: Jan 2012
Posts: 4
Likes: 0
Fuel Pressure Regulator? Help!!
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.
Le Mans Master
Joined: Mar 2004
Posts: 5,107
Likes: 171
From: Dublin CA
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.
Thread Starter
4th Gear
Joined: Jan 2012
Posts: 4
Likes: 0
From fuel pump to injectors bad all at once?
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.
Le Mans Master
Joined: Aug 2010
Posts: 9,272
Likes: 17
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
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
Instructor
Joined: Feb 2008
Posts: 177
Likes: 5
From: Toronto Ontario
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
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
Last edited by gmboileau; Feb 1, 2012 at 11:14 PM.
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