Fuel Pressure - Ford Powerstroke Diesel Forum
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post #1 of 8 Old 09-06-2018, 11:30 AM Thread Starter
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Fuel Pressure

What is proper fuel pressure for a 6.0? At idle I get 58-60 psi, cruising 65+mph I値l get 55-56 psi, but at WOT it値l go to ~49-50 and eventually to below 45 before I let up on the throttle. The truck has stock injectors, stock turbo, stock fuel system, and sct custom tunes. It has a very old blue spring from before I bought the truck. I have an adjustable pressure regulator from Accurate Diesel that I have yet to put on. What idling pressure should I dial it to when I put it on?


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post #2 of 8 Old 09-06-2018, 12:49 PM
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Ford says NEVER below 45 psig. That means at WOT. My opinion is never below 50 psig.
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post #3 of 8 Old 09-06-2018, 09:50 PM
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also above 70 i believe blow orings if i remember right...i would go 65 at idle and watch it

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post #4 of 8 Old 09-07-2018, 12:05 AM
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Ford said 75 psig max. Lots of people exceeded that in the old days and didn't have problems, at least not quickly (anyone remember the Gillette spring?).

I am observing a max limit as @john galt recommended ........ just that I am going w/ Ford's 75psig on this one, even though I am conservative on the low pressure end!

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post #5 of 8 Old 09-07-2018, 05:37 AM
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I'm just curious what causes the drop in the fuel pressure at WOT. In my case it was fuel filters clogged from a bad fill up. There can also be 15 years worth of gunk in the HFCM to clean out. I now get 56 PSI cruise and can drop to 52 for WOT stock with the blue spring mod.

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Good 6.0 Reading:
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post #6 of 8 Old 09-07-2018, 05:45 AM
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More fuel is being pushed through the injectors at higher injection pressures. Dirty filters only add to the problem. A full fuel tune, even on stock injectors will drop the FP quite a bit, especially right to start with. I've seen mine initially drop to ~40 psi on a WOT run, but it would begin to come back up pretty quickly. I had planned on going with the Accurate Diesel regulator or a Marty's system if I had kept the truck. I still want my son to do that.

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post #7 of 8 Old 09-07-2018, 12:32 PM Thread Starter
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Filters are clean, I forgot to clean out the water separator hole last time though. I値l do that when I change the regulator. Planning a n doing it Sunday if I知 not to depressed from the TAMU-Clemson game.


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post #8 of 8 Old 09-07-2018, 04:31 PM
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I'm on a Marty's Diesel regulated return with stock injectors. I'm rock steady on 58psi at idle or WOT.

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