where should fuel pressure be? - Ford Powerstroke Diesel Forum
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post #1 of 8 Old 04-13-2013, 03:12 PM Thread Starter
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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.

MB HPOP, PHP Hydra, AFE stage 2, 4" turbo back exhaust, gutted cat, ford reman trans, JW valve body, 6.0 trans cooler, EGT trans temp boost gauges, Hutch and Harpoon mod, riffraf FRx, Pro Comp leveling kit, 08 rear diff cover, 315 Toyo AT2,
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post #2 of 8 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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post #3 of 8 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

2000 F250 XcabSB, 4x4, 4" strait pipe, DIY intake, FRx, BDP tunes, WW2, 6.0 cooler, BTS VB, gauges, 55w digital projector HIDs
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post #4 of 8 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.

PIS 175/80's, Van Turbo with EBPV, BD Billet Wheel
Lots of money spent at RiffRaff
Holley fuel pump, in tank mods, crappy riding leveling kit, DP-F6, 5 Gauges+Edge CS in dash, CB radio in Dash, over 100 goofy little mods
Still pretty slow, just less slow now.
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Originally Posted by peixinho View Post
I love finally having my truck back... that 7.3 dog that I was driving was just not cutting it.
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post #5 of 8 Old 04-13-2013, 05:11 PM Thread Starter
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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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MB HPOP, PHP Hydra, AFE stage 2, 4" turbo back exhaust, gutted cat, ford reman trans, JW valve body, 6.0 trans cooler, EGT trans temp boost gauges, Hutch and Harpoon mod, riffraf FRx, Pro Comp leveling kit, 08 rear diff cover, 315 Toyo AT2,
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post #6 of 8 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.

PIS 175/80's, Van Turbo with EBPV, BD Billet Wheel
Lots of money spent at RiffRaff
Holley fuel pump, in tank mods, crappy riding leveling kit, DP-F6, 5 Gauges+Edge CS in dash, CB radio in Dash, over 100 goofy little mods
Still pretty slow, just less slow now.
Quote:
Originally Posted by peixinho View Post
I love finally having my truck back... that 7.3 dog that I was driving was just not cutting it.
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post #7 of 8 Old 04-13-2013, 05:35 PM Thread Starter
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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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MB HPOP, PHP Hydra, AFE stage 2, 4" turbo back exhaust, gutted cat, ford reman trans, JW valve body, 6.0 trans cooler, EGT trans temp boost gauges, Hutch and Harpoon mod, riffraf FRx, Pro Comp leveling kit, 08 rear diff cover, 315 Toyo AT2,
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post #8 of 8 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.

PIS 175/80's, Van Turbo with EBPV, BD Billet Wheel
Lots of money spent at RiffRaff
Holley fuel pump, in tank mods, crappy riding leveling kit, DP-F6, 5 Gauges+Edge CS in dash, CB radio in Dash, over 100 goofy little mods
Still pretty slow, just less slow now.
Quote:
Originally Posted by peixinho View Post
I love finally having my truck back... that 7.3 dog that I was driving was just not cutting it.
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