Low fuel pressure at WOT.. STILL! - Ford Powerstroke Diesel Forum
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post #1 of 43 Old 06-01-2014, 07:44 AM Thread Starter
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Low fuel pressure at WOT.. STILL!

I got my truck back together and running great, but I am still fighting a low fuel pressure at WOT. This started last July. I have 155/30 injectors, R/R fuel system, brand new Airdog 150 feeding a brand new factory pump. I have the regulator set at 55 psi, but will drop into the 40's at half throttle and into the upper 30's at WOT. I have been through 3 stock pumps and all have produed the same results. I took all my fuel lines off this winter and blew them out. I messed with the regulator today and it didn't make a difference either. It's really beginning to piss me off. Why else could it be doing this? 155/30's are not big injectors by any means. The Airdog did help, but before the Airdog, it would dip into the 20's. I'm about to say screw it and replace the factory with a Fuelab or something, but I wish I knew the real problem in the first place. I'm lost for ideas.


2005 Ford f350 CCSB King Ranch
MTW MadMax Turbo
Warren 155/30 injectors
EGR Delete
BPD Oil Cooler, FICM, Oil Bypass, Water pump
Flo-Pro 5" Exhaust, Cat Free, Muffler Free
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ARP Studs With Factory Gaskets
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TSD SPD. Thanks Chris,
Edge CTS monitoring
35x12.5x20 Dick Cepek FC-2 on Chrome Rockstars
4" Zone lift with Bilstien 5100's
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post #2 of 43 Old 06-01-2014, 09:02 AM
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Yep, your factory pump is SUPER WEAK

Nate
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post #3 of 43 Old 06-01-2014, 09:43 AM
Making ported intakes

 
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I'm n the same boat man. I got a fuel lab going in here soon

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6.0/6.4 Ported intake manifolds, turbos, air intakes, fuel systems and much much more!!!!
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post #4 of 43 Old 06-01-2014, 09:52 AM Thread Starter
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Yep, your factory pump is SUPER WEAK
Nate, I would fully understand this if it was the factory original pump. When it started doing it I bought another factory HFCM which was supposed to have 20k miles on it. It did the same exact thing. Then I went out and bought a brand new one from Ford and it too did the same exact thing. Then I added the Airdog and that helped but still drops below 40 psi at WOT. Are these pumps this bad from the factory? Even new ones can hold enough pressure? I wish I would have known that then, I wouldn't have kept wasting money on factory ones. Everyone kept saying 155/30's are nothing for a stock pump. I must have the extra thirsty versions. Live and learn I guess.


2005 Ford f350 CCSB King Ranch
MTW MadMax Turbo
Warren 155/30 injectors
EGR Delete
BPD Oil Cooler, FICM, Oil Bypass, Water pump
Flo-Pro 5" Exhaust, Cat Free, Muffler Free
All updated FORD Parts
ARP Studs With Factory Gaskets
PI Stallion Converter
TSD SPD. Thanks Chris,
Edge CTS monitoring
35x12.5x20 Dick Cepek FC-2 on Chrome Rockstars
4" Zone lift with Bilstien 5100's
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post #5 of 43 Old 06-01-2014, 12:39 PM
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I still have lower FP. Both my old one ( had around 40k on it ) and my new one is at 63-65. This is with the blue spring too... I don't know what's what. I would guess its gotta be in the tank.
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post #6 of 43 Old 06-01-2014, 04:00 PM Thread Starter
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I still have lower FP. Both my old one ( had around 40k on it ) and my new one is at 63-65. This is with the blue spring too... I don't know what's what. I would guess its gotta be in the tank.
Oh you reminded me of something else. I blew out the lines from the pump to the tank at first, and then I also added a sump when I put the Airdog on. So I got a sump with 1/2" lines to the Airdog150, and then to the factory pump, then brand new factory lines from the stock pump to the fuel bowl, then out to my heads through my R/R then out the back heads to the regulator. Everything points to the factory pump, but it just seems odd that I changed the factory pump twice.


2005 Ford f350 CCSB King Ranch
MTW MadMax Turbo
Warren 155/30 injectors
EGR Delete
BPD Oil Cooler, FICM, Oil Bypass, Water pump
Flo-Pro 5" Exhaust, Cat Free, Muffler Free
All updated FORD Parts
ARP Studs With Factory Gaskets
PI Stallion Converter
TSD SPD. Thanks Chris,
Edge CTS monitoring
35x12.5x20 Dick Cepek FC-2 on Chrome Rockstars
4" Zone lift with Bilstien 5100's
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post #7 of 43 Old 06-01-2014, 05:23 PM
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post #8 of 43 Old 06-01-2014, 05:38 PM
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OEM fuel fiters in the HFCM?

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post #9 of 43 Old 06-01-2014, 05:51 PM Thread Starter
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Originally Posted by Dave View Post
OEM fuel fiters in the HFCM?
Yes, brand new Motorcraft.


2005 Ford f350 CCSB King Ranch
MTW MadMax Turbo
Warren 155/30 injectors
EGR Delete
BPD Oil Cooler, FICM, Oil Bypass, Water pump
Flo-Pro 5" Exhaust, Cat Free, Muffler Free
All updated FORD Parts
ARP Studs With Factory Gaskets
PI Stallion Converter
TSD SPD. Thanks Chris,
Edge CTS monitoring
35x12.5x20 Dick Cepek FC-2 on Chrome Rockstars
4" Zone lift with Bilstien 5100's
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post #10 of 43 Old 06-01-2014, 07:53 PM
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I have 190 30's with the stock pump fed by a fass pump and a driven RR. And I never drop below 54 psi and its set at 57 psi... Could it be the regulator? I dunno

2006 CC SB, SRW, Barder stg #2, Ported manifold, Warren 190 30's, banks CAC, SCT Tuned by/IDP, IDP ficm tunes, nadp trans, fluidampr, FASS LP, Driven RR, edge insight, HPODS, BD ex manifolds, HD y pipe all ceramic coated & wrapped, UCF O-ringed heads with arp's, Colt stg 1 cam with RCD springs and tubes, 6" lift/trac bars, 37's 4:30 gears, Future mods: non VGT T4 64mm BASB
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