To much pressure from FPR? - Ford Powerstroke Diesel Forum
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Old 09-19-2010, 04:07 PM
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To much pressure from FPR?

I just did the fpr bb mod. Before the mod I measured around 50 psi, actually just under. After the mod I'm measuring just over 70 psi (70-73). Is 70 psi the absolute cutoff, or is just over ok? I've also cleaned the screen of any restriction. Just don't want to blow out the o-rings. Love the way it ran on the test drive I did after the mod.
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Old 09-19-2010, 04:16 PM
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70-73 is PERFECT! I did mine and i was getting 40-50 stock, did the BB mod, and it shot to 125. took it back out and it sticks right around 60 now. I dunno how it did that. LOL

you should notice nice driveability, and it wont blow out your seals or anyhting.
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Old 09-19-2010, 04:23 PM
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Thanks for the quick reply. What is the top limit that should not be exceeded? Read in another site that it was about 80 psi.
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Old 09-19-2010, 04:33 PM
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yeah, I wouldnt push it much past what you have it at now.
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Old 09-19-2010, 04:40 PM
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Yeah, I was just curious. The only info I could find in my search was "do not exceed 70psi". I figured a few psi over wasn't going to cause any problems, but there was no information on how much over 70 is still safe. Thanks again!
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Old 09-19-2010, 04:47 PM
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no prob man
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Old 09-21-2010, 09:15 AM
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Smile Fuel Pressure

Quote:
Originally Posted by HVAC SuperTech View Post
70-73 is PERFECT! I did mine and i was getting 40-50 stock, did the BB mod, and it shot to 125. took it back out and it sticks right around 60 now. I dunno how it did that. LOL

you should notice nice driveability, and it wont blow out your seals or anyhting.
Hey just a thought, I just discovered this with my 96 F250 after experiencing 95 PSI at Idle. I took off the FPR to clean it better and noticed that the plugger thingy behind the Spring doesn't slide in and out by itself. If I put it in and pushed it and turned the FPR upside down the Plugger never fell out on its own. And this was after cleaning with Carb Cleaner. So I took a small pick and scratched the the inside area better. Ten cleaned with cleaner and shop towel. Now the thing goes in and has much more range of motion and will slide in and out freely. I figure over time the residue caused the plugger to bind in the chamber and the spring wasn't doing much. It would take the Pump getting 95 PSI before it would move the plugger to allow the Fuel to move past it. As soon as I did that improvement I started seeing mid 40's at idle which I am very happy about now. Yes it may be a sign that I have a tired Fuel Pump (Lift Pump) but at least now I'm not always afraid of pop the Fuel lines. For cleaning on the truck I would recommend using Carb Cleaner and the eraser end of a new wood pencil and shop paper towel. Maybe even a nice pipe cleaner brush that is like 1/4" or larger.

Clean the spring also if it needs it.
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