Fuel psi problems
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Hotshot
Joined: Jul 2003
Posts: 12,177
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From: Newport, WA
Fuel psi problems
Okay, some of you may recall a while back I had fuel gelling issues with my truck, and a few months back I started to notice it running kind of funny so I bought a tire pressure gauge and tested the fuel pressure. It was 108psi at the time. Fast forward to today, I hadn't had the time or ambition to mess with it but finally got around to it today. Pulled the fuel bowl, completely disassembled it, disassembled/cleaned the FPR and threw all new O-rings at it. Nothing looked funky or out of place, no shim in the FPR, nothing unusual at all. I took the fuel cap off and blew compressed air through the return line, no blockage at all. Reinstalled the fuel bowl, fired it up... 100psi. Now that I think about it, the one thing I forgot to do was blow compressed air back through the line that goes from the bottom of the FPR to the bottom of the fuel bowl. Is it worth my time to pull the FPR off tomorrow and try that? Any other suggestions?
96 CA emissions F350, bone stock motor and fuel system.
96 CA emissions F350, bone stock motor and fuel system.
Thread Starter
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Hotshot
Joined: Jul 2003
Posts: 12,177
Likes: 40
From: Newport, WA
When I tested it the first time, the gauge was brand new out of the package but I didn't go buy a $20 gauge knowing I'd be trashing it by using it for fuel psi testing. I guess the next step is to get my EV2 fuel psi gauge installed and see what it says. I'm assuming I can just remove the OEM schrader valve and put the sender for the gauge in its place?
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Joined: Aug 2006
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When I tested it the first time, the gauge was brand new out of the package but I didn't go buy a $20 gauge knowing I'd be trashing it by using it for fuel psi testing. I guess the next step is to get my EV2 fuel psi gauge installed and see what it says. I'm assuming I can just remove the OEM schrader valve and put the sender for the gauge in its place?
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Posting Guru
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i dont see the stock pump being able to put out that kind of pressure. i think you would have destroyed the orings by now. but 100lbs is a scary thought!
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Postmaster
Joined: Feb 2004
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From: Levittown
How would 100psi destroy the o-rings????
At 100 psi you have a problem in the fuel system.
Most common would be an oil leak.
Bill
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Joined: Feb 2004
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From: Levittown
Ca is a higher pressure than 49 state.
The higher pressure is due to splitshots.
55 to 60 psi.
Thus the reason for the damper.
Bill
The higher pressure is due to splitshots.
55 to 60 psi.
Thus the reason for the damper.
Bill
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Hotshot
Joined: Jul 2003
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From: Newport, WA
CA models are rumored to run higher pressures than the 49 state models but 100psi is still a bit excessive.
No sign of oil contamination in the fuel when I drained the bowl. The fuel was green, not dark at all. Looked similar to pickle juice. Maybe that's because I drained it into a pickle jar... 
