Thread: 2000 l67 Park Ave fuel pressure

Did you find out from checking the oil or you just noticed it was driving funny?

No the car drove fine, while I was changing the supercharger the injector stuck open, it was not leaking before as it would hold 50psi for over 4 hours. It actually hydro locked the engine. But a slow small leak can cause what you are seeing, pull the dipstick and give it a good snort as Corey so eloquently put it.

Originally Posted by J57ltr

There she blows! We have a leaker.



Now to clean up a spare.

Jeff

Over 4 hours? Mines doesnt hold that long its either one of my rusty gas lines which I doubt. Leaky injector or both. Ill snort it when I get off work.

It could also be he regulator, as I have an 05 my regulator is in the fuel pump assembly. 4 hours is the longest I have tried to test it. I did come out one morning and still had over 30 psi on the gauge, since I still left it plugged into the cigarette lighter.

Now what I did was remove the gauge from my fuel injector pressure tester and screw an oil pressure sender (Aftermarket) into it's place. I wired it to the oil pressure gauge (aftermarket) in the car and since it was only meant for a temporary test I just used a cig lighter plug to apply power to the gauge. I ran around for 3 days to monitor fuel pressure to see why I was going lean (at the time) and had a constant 60+ psi all the time. Under load, idling, doesn't matter. I left it plugged in after work one day and came out to check it about 10pm and it was still over 50psi and another day I forgot to unplug it and saw that I still had over 30psi on the gauge, and was wondering why it even showed pressure at all, then realized it was still plugged in. So when this happened I hooked it back up and turned the key on and as soon as the pump stopped the pressure dropped to 0, unplugged all the injectors and turned the key on and same thing then I knew I didn't have a weak starter and I had a leaking injector. As you can tell from the pic it wasn't a little dribble but Old Faithful herself...

Jeff

Oh really. Well idk, It doesn't smell like straight motor oil, there maybe a slight hint of gas smell or my mind is playting tricks on me. But it sure doesn't smell like straight motor oil. (comparing to fresh oil). Maybe I should've asked some other people if smells like gas mixed. I thought about switching to returnless fuel setup but I think ima keep the return set up

It would just be a leaky injector, if the intake valve is open then the injector will just drip slowly and get into the cylinder where it leaks past the rings. Gas is so thin it can do that. If you are driving around for any length of time where the engine stays at temp for a while the fuel will evaporate and get circulated through the PCV system and burned.

If the valve is closed then the gas will pool behind the intake valve and evaporate into the manifold so you end up with this overly rich mixture that pretty much stays around for hours sometimes. When you try to start it you end up having to clear this mixture plus what starts being sprayed from the injector and draw fresh air in. This causes long canning times. Went through that with my 97' PA NA (don't remember the number).

The other thing is that it only leaks down the pressure that is built up. So it's not like mine that one was totally open. I have had injectors on the stand and as you bring up the pressure some will start to drip. Most of the time it's just a little bit like 1 drop every 10'secomds, other times it's like 1 in 3 seconds. Junkyard injctors can really be bad as they have the rails removed then the fuel just sits there and evaporate and down here it gets in the mid 90's most of the time. I used to pull a lot of them and clean and flow them and match them up and have sets ready to go.

I'm not saying that's what it's got to be but but its the only thing I can think of.

Try to light your dipstick on fire. lol j/k.


Jeff

Iit do it out in the open.

Well where are you at now?

Lost. I lit the dipstick and it didnt catch fire which mean theres no fuel in the oil. Only thing left is the fuel lines or something with the exhaust, that ragedy sound between the rear mani and front pipe. Even though the cat is kind of new. Only code I had was an small leak in the evap. Im going to get rid of this 180 thermstat and go back to stock as it never reaches operating temp.

I think I may have found the problem to my performance woes which could be a broken rear motor mount