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Old 08-29-2008, 07:43 AM
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Exclamation Is this right?!

At idle fuel pressure bounces between 40-60 psi.

At 2500 rpms sitting in the driveway it falls flat to about 20 psi.

Is that right?

Last edited by jeff power; 08-29-2008 at 07:47 AM.
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Old 08-29-2008, 07:48 AM
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That is NOT right.

Fill out your sig so we know what your working with. (IE- OBS fuel Pressure is different then the SD.)
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Old 08-29-2008, 07:52 AM
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Sorry it's a 96 7.3 powerstroke.

Last edited by jeff power; 08-29-2008 at 08:00 AM.
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Old 08-29-2008, 08:03 AM
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nope thats not right , it actually should climb , it will bounce just because of the manual pump, but on accel should gain pressure , under load up to 100 or so , either your pump is weak or the regulator is letting it drop, there has been problems with the screen in the side of the filter housing getting clogged , remove the 2 10mm bolts out of the side ,and clean that screen
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Old 08-29-2008, 08:04 AM
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OK stock on the OBS is 40 to 70 PSI.

As you accelerate the pressure should go up to the higher numbers. One of the modifications is to "shim" your fuel pressure regulator. This raises the idel pressure so you get better pedel responce.

Some where in the system is a screen that may be dirty. But I'm not sure on it's location.
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Old 08-29-2008, 09:10 AM
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OK pulled the screen, dirty as sin, screen was actually "unattached" from the little plastic holder it's attached to.

Edit,

Ford has it part# F6P29150BA $81 here where I live

Do you think it would be alright to run without that little screen? The fuel just goes right into the filter bowl from there, and the filter should catch any crap.

Last edited by jeff power; 08-29-2008 at 09:21 AM.
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Old 08-29-2008, 09:30 AM
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its there for a reason
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Old 08-29-2008, 10:01 AM
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Yep I figured that so I just put all back together. Still have the same problem although pressure is not dropping quite as much now.

60 at idle 30 at WOT. Guess it's time to pull the fuel pump.
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Old 08-29-2008, 10:15 AM
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can a clogged screen cause bad mpgs??? and were exactly is the screen located?
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Old 08-29-2008, 11:29 AM
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Quote:
Originally Posted by bockhold View Post
can a clogged screen cause bad mpgs??? and were exactly is the screen located?
X2 on the location
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