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Old 03-29-2014, 06:58 PM
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fuel pressure problems??

Alright guys so I got my electric fuel pressure gauge installed today and this is what I got.
57-58 psi at idle and 38-40 psi WOT.

I know at idle it should be somewhere around 60 psi but have read that up to 70 psi is ok. Is shimming the FPR gonna help or is that band aid for a cut needing stitches? What is a good psi for WOT? What else could cause this much of drop during WOT? Weak pump maybe?
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Old 03-29-2014, 08:30 PM
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Sounds like a weak fuel pump to me. Unless you have a rear mounted steel tank and your mixing screens are clogged up. If you have a side mounted plastic tank then I'd point towards a weak pump.

When you turn the key on how fast does it build pressure? When you free rev it how much pressure does it drop?


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Old 03-30-2014, 06:39 AM
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2001 f350 SRW. It's a side plastic tank. I took the tank out last weekend due to running out of fuel at 1/4 tank. Pickup foot was broken off so I replaced that and went ahead and cleaned the screens as well so those are good to go. Just checked it'll only build about 50 psi with KOEO. Started the truck and it took a minute to get up to 58-60 psi. Should I hold it at a certain rpm or just rev it to like high 2000's rpm and let off?
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Old 03-30-2014, 06:51 AM
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Just rev it up like you're showing off. Thats the best way to describe it. Tell us how much pressure drops from free revving it.


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Old 03-30-2014, 09:44 AM
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It drops to about 50 or little below with slightly "showing off", but I can get it to 40-42 if I really rev it up.
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Old 03-30-2014, 01:51 PM
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Change pump on frame. Aftermarket is around 100$



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Old 03-30-2014, 02:22 PM
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I'm guessing this would explain 11 mpg in town and about 14 highway? Also trouble trying to pull 4-5000 pounds up hills?
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Old 03-30-2014, 02:25 PM
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Starving for fuel hellzyeah


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Old 03-30-2014, 02:32 PM
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Good deal. Thanks for the help man. Any recommendations on pumps or just grab one from oreillys/adavance/napa?
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Old 03-30-2014, 02:35 PM
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Any of those will be fine.


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