Low fuel pressure at WOT.. STILL! - Ford Powerstroke Diesel Forum
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  #1  
Old 06-01-2014, 07:44 AM
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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.
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Old 06-01-2014, 09:02 AM
BACKYARDIGAN


 

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Yep, your factory pump is SUPER WEAK
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Old 06-01-2014, 09:43 AM
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I'm n the same boat man. I got a fuel lab going in here soon
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Old 06-01-2014, 09:52 AM
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Quote:
Originally Posted by windrunner408 View Post
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.
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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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  #6  
Old 06-01-2014, 04:00 PM
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Originally Posted by MrOneEyedBoh View Post
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.
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Old 06-01-2014, 05:23 PM
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Danm.... Dunno bro.
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  #8  
Old 06-01-2014, 05:38 PM
Almostdunfukinwidit


 

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OEM fuel fiters in the HFCM?
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Old 06-01-2014, 05:51 PM
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Originally Posted by Dave View Post
OEM fuel fiters in the HFCM?
Yes, brand new Motorcraft.
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  #10  
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
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