Fuel pump going bad? - Ford Powerstroke Diesel Forum
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  #1  
Old 11-20-2012, 09:41 AM
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Question Fuel pump going bad?

Ok here's the problem. The truck(caused by the engine I'm sure) starts vibrating from about 1500RPM all the way upto 2300RPM. It starts about when the truck shifts into second at about 25-30 MPH then all the way upto (and beyond I'm sure) 75MPH while in over drive. When I come off the HWY and just let her idle its still pretty rough but it will smooth out after about 15 min of idleing. It gets so bad my headlight switch is ratteling in the dashboard and my headrest posts are vibrating inside the seat back! If I switch to the rear tank it almost vibrates me outta my seat, but on the front tank its bearly bearable. I have JUST changed the oil (45 miles ago) cleaned/rebuilt my fuel bowl and replaced the fuel filter 250 miles ago, swapped tranny oil and replaced filter and gasket 500 miles ago, and replaced the ECM with a new Re-Man about 250 miles ago. The injectors and HPOP were replaced 500 miles ago. The fuel pressure is 35 to 55 PSI (it bounces back and forth with the pump pulsation) at an idle but I can't get a reading on it while driving. The first time she was on the HWY since Jan (that was the first time since I owned it) was after the ECM change, but before the oil change. Since the oil change I went back out to the HWY to see if its gone but alas!! it isn't. Could this be caused by a weak fuel pump? It's about the only thing I havn't touched/cleaned/replaced.
Ok any ideas?

Last edited by PoppaSmurff; 11-21-2012 at 09:19 AM. Reason: added fuel pump pressure reading
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  #2  
Old 11-26-2012, 11:05 AM
Hee Hee, he's doing it...
 

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Sounds like a weak Fuel pump. Your needle aught to bounce in the 45-65 zone (averaging 55psi). Shim the FPR and see if it comes back. If it does then either keep it shimmed or order a Cali FPR spring.
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Old 11-26-2012, 11:57 AM
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Oh ya, well the spring is already mod-ed so I guess it's gotta be the pump.
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Old 11-26-2012, 12:08 PM
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35-55 psi with the shim? Not looking good for the fuel pump. Sorry bud.
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Old 11-27-2012, 04:35 PM
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Ok did the fuel pump but couldn't bring myself to bend a $75.00 wrench to do the banjo bolt........so I cut a cheap impact socket up and welded it to a piece of steel I had laying around, worked great to break the torque and tighten it back up!
Thanks for your input BigFuel The beast came right to life and my fuel pressure is 50-70 PSI (needle bounce) at idle and she's a BEAST now on the road. One draw-back though, I broke the EBP sensor when I hit it with the old pump climbing off the front of my truck. so off to get a new one . One thing after another!!!!!
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Old 11-27-2012, 06:01 PM
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Go to a pick and pull. When you walk out tell them it's a oil pressure sender off something really common.
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