Fuel pressure issues

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Jul 16, 2016 | 12:52 PM

Tyler.172

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Joined: Feb 2013

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Fuel pressure issues

Alright guys its been awhile since ive been on here my son was born 5 months ago so ive been pretty busy! I was having concerns about my fuel pressure so i took a few readings:
Idle: 15psi
Regular acceleration: 20psi
Hard acceleration:20psi
WFO: 23psi
Cruising at 70mph: 20psi
So I did the bb mod and just got readings:
idle: 20psi
Regular acceleration: 80psi
Hard acceleration: 80psi
WFO: 80psi
Cruising at 70mph: 80psi
now when I let off the throttle at 60+mph it maxes the gauge out at 100psi and hangs there until i am back on the throttle or my speed drops below 50-55. I cleaned the screen and its a new fuel filter. Any insight or comments or advice would be appreviated!

Jul 16, 2016 | 01:28 PM

knottyrope

Lead Driver

Joined: Apr 2016

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From: Bahstun

100 is a bit hi. Maybe you had something keeping the Regulator open and now that it closes you have too much pressure. Remove BlackBerry and take readings again.

Jul 16, 2016 | 01:35 PM

Tyler.172

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I just took it out, havent taken readings again yet, i might be going to a good friends house to get a known good fpr from him to try that if it doesnt change for the better

Jul 16, 2016 | 02:15 PM

Tyler.172

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Now its 20psi at idle and everything else is 50psi

Jul 16, 2016 | 04:18 PM

IDMooseMan

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Joined: Jul 2006

Posts: 2,756

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From: Nampa, ID

Still low. "Normal" fuel pressure range is 40 - 80 PSI at idle.

Jul 17, 2016 | 06:27 AM

Tyler.172

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Joined: Feb 2013

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Thats what I thought, in a few weeks ill be getting a different fpr to swap and hopefully that will do the trick, unless there is something im missing, the lift pump is pretty new as well

Jul 17, 2016 | 11:08 AM

fordpride

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Joined: Dec 2009

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From: Livoina,La

Just pull the FPR apart clean and reseal it

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Jul 19, 2016 | 04:22 PM

IDMooseMan

Cargo Master

Joined: Jul 2006

Posts: 2,756

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From: Nampa, ID

When you remove the FPR for cleaning, make sure you don't drop the o-rings into the engine valley.

I didn't realize mine had fallen out. I had a huge fuel "leak" at the FPR. Fuel accumulated so deep, I had to use my angled pick and go "fishing" for the missing o-ring in the "pond" of fuel. After 20 minutes of scraping the valley, I landed the o-ring and all was well. I now keep "spare" o-rings in the garage/toolbox/break-down box, just in case.