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Losing Fuel Pressure
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Question
jtupper
I'm having issues with the fuel pressure dropping after it sits for a while. I had another thread going about it HERE. I ended up replacing the fuel pressure regulator and it was fixed...for about two days. Now it's doing it again, although not nearly as bad as it was. I don't see any fuel in the vacuum line on the FPR like I did in the old one.
Some background...
This is the 3rd FPR I've put in it since I bought it. Th two times before, I could turn the key over and let the fuel pump cycle and it would start right up. This time it wouldn't do that so I thought maybe it was the fuel pump going out. I ended up taking the chance and bought the FPR. Like I said, all was good for two days. Defective maybe???
I went downand picked up a fuel pressure gauge this afternoon and took some readings. When I turn the key on and let the fuel pump cycle, the pressure goes up to about 50 psi. When I start her up, the pressure drops to about 42-44 psi and holds steady. When I turn it off, the pressure builds back up to about 50 psi again over the course of about two minutes, then slowly begins to drop. The pressure dropped about 10 psi over the first half hour, then dropped all the way to zero within the next half hour.
It has a brand new fuel filter also. I can find no visible leaks nor do I smell fuel. This leads me to beleive that either the FPR is defective or maybe I have a leaking injector. The real question is how do I figure out exactly what the problem is? I could really use some help here.
Appreciate it guys...
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