where should fuel pressure be? - Ford Powerstroke Diesel Forum
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Old 04-13-2013, 03:12 PM
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where should fuel pressure be?

I have the riffraff Frx it comes with 3 springs. Just wondering where the fuel pressure should be at? I bought a gauge and hose from harbor freight but i can't find anyone thats open with the #4 orb fitting that I need. I will go to a local hydraulic place on monday. I have herd that its bad for the injectors to not have enough fuel pressure. Maybe someone could help educate me.
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Old 04-13-2013, 03:23 PM
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I doubt you'd notice any difference with any of them...

Pick one, maybe the middle one, I put in the heavy one (I'm not sure why ) but our stock engines don't suffer from fuel starvation. By THEORY, because 6 & 8 fire sequentially, there might be some advantage in slightly higher pressure to fill the 2nd fired injector but, as I said, I don't think it's ever gonna make any real difference.
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Old 04-13-2013, 03:24 PM
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i don't remember which color but the directions will tell you the recommended spring and what each one is supposed to be. 65 sticks in my head but i may be wrong, i'm sure someone else will chime in
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Old 04-13-2013, 05:04 PM
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My fuel system is 100% stock and my pressure holds at 65psi
Lowest it goes at full throttle is 59psi

@ early99psd, you can buy an AN -4 to 1/8 npt fitting from any local hotrod shop for dirt cheap and just put an o-ring on it. I found that to be cheaper and nicer looking than the offerings at the hydraulic supply place.
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Old 04-13-2013, 05:11 PM
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So when you say 100% stock do you mean nothing at all has been done. So with the FRx that I have that's why is am wondering which spring should I run.


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Old 04-13-2013, 05:24 PM
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Yes, nothing has been done to my fuel system other than adding a gauge. I was just letting you know about the AN fitting so you can get going if that's more convienient than a hydraulic store.
And I was just letting you know what my fuel pressure was so that you have a basis for comparison once you get it all hooked up.
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Old 04-13-2013, 05:35 PM
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Thanks for the info. Once I get this thing hooked up and test things I will see where their at. I think it's just more piece of mind. Truck is running great, I just like to know where things are before there a problem.


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Old 04-13-2013, 06:01 PM
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You and me both man. Thats exactly why I got the fuel pressure gauge.
Heck,I have 5 gauges and an insight displaying 5 more things just to keep on top of things.
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