proper fuel pressure with my FPX - Ford Powerstroke Diesel Forum
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Old 08-13-2010, 04:20 PM
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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
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Old 08-13-2010, 11:11 PM
SJB SJB is offline
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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.
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Old 08-14-2010, 01:41 AM
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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.
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Old 08-14-2010, 07:19 AM
SJB SJB is offline
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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.
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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.
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Old 08-15-2010, 07:32 PM
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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...
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Old 08-16-2010, 09:14 AM
SJB SJB is offline
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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?
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Old 08-16-2010, 02:27 PM
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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.
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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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