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Old 09-10-2009, 09:14 AM
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V10 fuel pressure?

Any body changed a fuel pressure regulator on one of these? I'm having an issue with it running really lean, like laying down with no power lean.I put the pressure gauge on it and I'm running an even 30 pounds at the rail. Changed the filter in hopes, but no change.
Just changed the O2 sensors and they were both white.
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Old 09-10-2009, 11:38 AM
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i had the exact same thing...i had to replace the fuel pump...ended up having sugar in my tank...but, make sure u test the pressure while driving. mine had 30 at idle, but driving it only had like 15...strap the gauge to the wiper and watch it. probably a fuel pump problem...good luck
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Old 09-10-2009, 02:06 PM
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Guess I should have taken a test drive before posting. Changing the O2 sensors straightened the problem out. Go figure, I knew that they could go bad and not throw codes, but had never had one fail on me like this before.

Out of curiousity I ran it with the fuel pressure gauge hooked up, It stuck constant on thirty, I even tried pressing the pressure relief vavle on the side of the gauge and it didn't even stumble, pressure dropped to 20 and then bounced right back up to 30.
Now if I can trace down my itermittent miss I'll be set. I have the feeling that the plugs are original, judging from everthing else I've fixed so far.
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Old 09-11-2009, 08:15 AM
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You should get about 38-40 with the vacuum disconnected from the regulator.
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Old 09-11-2009, 08:15 AM
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