proper fuel pressure with my FPX - Ford Powerstroke Diesel Forum
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post #1 of 9 Old 08-13-2010, 04:20 PM Thread Starter
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proper fuel pressure with my FPX

I just installed a RiffRaff FPX in my excursion. I have a under the hood fuel pressure guage from Stealth and it is reading 95-100psi, at times a bit more. is this OK? or way to high?

it says it should provide 65-67 psi, but that is way off what I have. I am also fairly certain the spring is seated correctly, as I took my time to install this so that i didnt have to take it back apart.

http://www.riffraffdiesel.com/mm5/me...e=F731-FS-MISC

http://www.stealth-automotive.com/in...roduct_id=1024

-DIY Tymar Intake
-ZooDad
-4" MBRP w/ 5" tip
-Guages
-HPX
-CCV mod
-New boots...
-Fuel Rail X
-DieselSite Transmission Filter
--W/ Guage and Flush valve
-Factory Tech Valve Body
-Stage 2 Snow Performance Water Meth
-AFE Blade Runner Intake Manifold
-TurboMaster WasteGate Control
-DieselSite Boost Relief Valve
-AIH Delete
-Garrett High Flow Outlet
-Garrett NON-EBPV Pedestal
-Plenum Inserts
-Torque Converter Lock Up Switch
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post #2 of 9 Old 08-13-2010, 11:11 PM
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It was my understanding that the kit would be around 65 psi. Around 100 psi seems really high if that is accurate. I don't have enough knowledge about the system to tell you whether it would hurt anything or not.

I am curious how the install went? I'm saving up for both my FRx and HPx kits right now, and looking for any feedback that I can get.

2002 F250 XLT CC 4x4
- Isspro EV gauges (Pyro, Trans temp, Boost)
- Walker BTM Muffler
- DIY Intake w/ AMSOIL 4095 washable/reusable filter
- 6.0 Liter Transmission Cooler
- '08 Kool-Vue tow mirrors
- Tuff Country 2.5" leveling kit 22962KN
- Factory F350 blocks in the rear
- Readylift 67-2094UB u-bolt kit for the rear
- Moto Metal 970 18x10's w/ -24 offset
- Cooper Discoverer S/T Maxx 295/70-18's
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post #3 of 9 Old 08-14-2010, 01:41 AM Thread Starter
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I'm talkign with Clay at RiffRaff and he says the high pressure will affect MPG's but that's it. I guess i will check the spring again....

The HPX was easy for me cause I was changing the turbo boots at the time so my engine valley was mostly empty. I imagin it could be hard to do if everythign was inthere. The FPX wasnt bad but both plugs are a SOB to get too, especially the passanger side. I almost took the AC brackett off. once you get the 2 nipples in the ports though, it's pretty much smooth sailing from there.

-DIY Tymar Intake
-ZooDad
-4" MBRP w/ 5" tip
-Guages
-HPX
-CCV mod
-New boots...
-Fuel Rail X
-DieselSite Transmission Filter
--W/ Guage and Flush valve
-Factory Tech Valve Body
-Stage 2 Snow Performance Water Meth
-AFE Blade Runner Intake Manifold
-TurboMaster WasteGate Control
-DieselSite Boost Relief Valve
-AIH Delete
-Garrett High Flow Outlet
-Garrett NON-EBPV Pedestal
-Plenum Inserts
-Torque Converter Lock Up Switch
cesspool is offline  
post #4 of 9 Old 08-14-2010, 07:19 AM
SJB
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Quote:
Originally Posted by cesspool View Post
I'm talkign with Clay at RiffRaff and he says the high pressure will affect MPG's but that's it. I guess i will check the spring again....

The HPX was easy for me cause I was changing the turbo boots at the time so my engine valley was mostly empty. I imagin it could be hard to do if everythign was inthere. The FPX wasnt bad but both plugs are a SOB to get too, especially the passanger side. I almost took the AC brackett off. once you get the 2 nipples in the ports though, it's pretty much smooth sailing from there.
Thanks for the feedback.

2002 F250 XLT CC 4x4
- Isspro EV gauges (Pyro, Trans temp, Boost)
- Walker BTM Muffler
- DIY Intake w/ AMSOIL 4095 washable/reusable filter
- 6.0 Liter Transmission Cooler
- '08 Kool-Vue tow mirrors
- Tuff Country 2.5" leveling kit 22962KN
- Factory F350 blocks in the rear
- Readylift 67-2094UB u-bolt kit for the rear
- Moto Metal 970 18x10's w/ -24 offset
- Cooper Discoverer S/T Maxx 295/70-18's
SJB is offline  
post #5 of 9 Old 08-15-2010, 11:28 AM
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Its a FRX (fuel rail crossover).

Yes that is high for the fuel pressure.Talk with Clay he will walk you through it and help find the prob.Great guy to deal with.

2001 CC auto 4x4 S&B,DP,RR,intank mods,WW,1.00 housing,4" turbo back,Isspro gauges,and to much little stuff to remember
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post #6 of 9 Old 08-15-2010, 07:32 PM Thread Starter
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It's fixed. Clay was al,ot of help. I cant believ it was th spring after triple checking it when i installed it...

-DIY Tymar Intake
-ZooDad
-4" MBRP w/ 5" tip
-Guages
-HPX
-CCV mod
-New boots...
-Fuel Rail X
-DieselSite Transmission Filter
--W/ Guage and Flush valve
-Factory Tech Valve Body
-Stage 2 Snow Performance Water Meth
-AFE Blade Runner Intake Manifold
-TurboMaster WasteGate Control
-DieselSite Boost Relief Valve
-AIH Delete
-Garrett High Flow Outlet
-Garrett NON-EBPV Pedestal
-Plenum Inserts
-Torque Converter Lock Up Switch
cesspool is offline  
post #7 of 9 Old 08-16-2010, 09:14 AM
SJB
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Quote:
Originally Posted by cesspool View Post
It's fixed. Clay was al,ot of help. I cant believ it was th spring after triple checking it when i installed it...
I'm planning on installing one of these kits, but I wasn't planning on installing a gauge. Is there anyway I would know if I possibly had the spring in there wrong by (feel or performance) if I didn't have a gauge?

2002 F250 XLT CC 4x4
- Isspro EV gauges (Pyro, Trans temp, Boost)
- Walker BTM Muffler
- DIY Intake w/ AMSOIL 4095 washable/reusable filter
- 6.0 Liter Transmission Cooler
- '08 Kool-Vue tow mirrors
- Tuff Country 2.5" leveling kit 22962KN
- Factory F350 blocks in the rear
- Readylift 67-2094UB u-bolt kit for the rear
- Moto Metal 970 18x10's w/ -24 offset
- Cooper Discoverer S/T Maxx 295/70-18's
SJB is offline  
post #8 of 9 Old 08-16-2010, 02:27 PM
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Quote:
Originally Posted by cesspool View Post
It's fixed. Clay was al,ot of help. I cant believ it was th spring after triple checking it when i installed it...
Nice! Glad to hear Clay was good help.

2001 CC auto 4x4 S&B,DP,RR,intank mods,WW,1.00 housing,4" turbo back,Isspro gauges,and to much little stuff to remember
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post #9 of 9 Old 08-23-2010, 04:48 AM
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Quote:
Originally Posted by SJB View Post
I'm planning on installing one of these kits, but I wasn't planning on installing a gauge. Is there anyway I would know if I possibly had the spring in there wrong by (feel or performance) if I didn't have a gauge?
I would be curious about this as well.
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