? For Those With Riffraff FRx - Ford Powerstroke Diesel Forum
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post #1 of 16 Old 10-17-2013, 08:37 PM Thread Starter
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? For Those With Riffraff FRx

Which spring did you use and what is your actual fuel pressure?

I installed the gold spring and am only seeing 55 lbs, running. With the FRx bypassing the internal regulator on the fuel bowl, it makes sense to me the pressure would be lower but I just want to make sure. I'm trying to figure out if my fuel pump is on the way out, maybe (probably) screens in the tank are plugged, or if it is worth the effort to change out to the black spring. Thanks.

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post #2 of 16 Old 10-18-2013, 07:17 AM
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leave the spring in and run WOT runs while watching f/p gauge. See if it dips down. If so, to what #?

99.5 x-cab 7.3l, 6spd, 161k miles.....
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post #3 of 16 Old 10-18-2013, 11:04 AM
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is your fuel pressure relief worn out as well.
thats another thing to check.


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post #4 of 16 Old 10-18-2013, 11:37 AM Thread Starter
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Originally Posted by timmyboy76 View Post
leave the spring in and run WOT runs while watching f/p gauge. See if it dips down. If so, to what #?
Hose on the gage won't reach to where I can see it while driving.

01 F250 XL Ex Cab: RIP 12-15-2013
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post #5 of 16 Old 10-18-2013, 11:38 AM Thread Starter
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is your fuel pressure relief worn out as well.
thats another thing to check.
Replaced it with new when I rebuilt the fuel bowl.

Still interested in what others are getting for pressure at idle.

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post #6 of 16 Old 10-18-2013, 12:12 PM
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i got first gen frx and seeing 70psi. You want to know what it drops to when at wot.

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post #7 of 16 Old 10-18-2013, 12:59 PM
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Gen II FRx here. 68-70psi at idle, drops to 62, maybe 60 at WOT.

2014 F150 SCREW XLT 4x4 Ecoboost.
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post #8 of 16 Old 10-18-2013, 01:34 PM Thread Starter
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Which spring? Silver Gold or Black?

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post #9 of 16 Old 10-19-2013, 08:13 AM
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Black Spring

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post #10 of 16 Old 10-19-2013, 01:33 PM
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frx is on my list.
my buddy just got one. get a 8 point 5/16 socket, it will make the job sooo much easier.
i snagged his gold spring and am using it but he is using the black spring.


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99.5 f250 7.3 4x4 260k FF 160/30, PHP Hydra, S&B CAI, 4" Exhaust, RR Billet Wheel, Autometer Gauges, Transgo, Non-Ebpv Pedestal, High Flow Outlet, 08 Tow Mirrors.

Dad-2000 7.3 4x4 110k miles, Autometer Gauges, Superchips 1705, 6637, 4" Exhaust, BD Billet Wheel, TruCool Max
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