FRx spring
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Junior User
Joined: Feb 2011
Posts: 95
Likes: 0
From: Cherry, Il
FRx spring
Just got my frx in the mail yesterday. Will be putting it on possibly this weekend. What spring should I use? I was going to use the black one which is the highest pressure. I was thinking the more the better in this case. Am I wrong? Would using that one be the best?
Postmaster
Joined: Dec 2008
Posts: 3,340
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Clay recommended using the gold one. Not sure exactly why but others can chime in on that. Have you already started the install? The plugs were a little bit of a pain to get loose. WD 40 and pb blaster over a few days made life a lot easier. Greg's tips in this thread helped out a lot. https://www.ford-trucks.com/forums/1...n-my-butt.html
Post Fiend
Joined: Nov 2007
Posts: 9,549
Likes: 14
From: Payson, AZ
Whatever spring you use be certain it is not cocked when install is complete. A cocked spring pegged my 100 PSI fuel gauge.
Personally I would not alter the FPR without a fuel gauge and would also install an FPR rebuild kit.
Guzzle's FPR Rebuild Kit
Personally I would not alter the FPR without a fuel gauge and would also install an FPR rebuild kit.
Guzzle's FPR Rebuild Kit
Cargo Master
Joined: May 2010
Posts: 3,047
Likes: 10
From: Snohomish, WA
I installed the factory spring in my GEN 2 FRx, I see 65-67 psi normally and 60-62 psi under WOT. My gauge sender is located post filter.
Robin makes a good point, you should always verify your mods before and after. You can pick up an inexpensive fuel pressure test gauge at most auto parts stores. I think even Harbor Freight sells them pretty cheap. That will allow you a baseline and a post mod reference to use.........besides it gives a reason to buy more tools!
Robin makes a good point, you should always verify your mods before and after. You can pick up an inexpensive fuel pressure test gauge at most auto parts stores. I think even Harbor Freight sells them pretty cheap. That will allow you a baseline and a post mod reference to use.........besides it gives a reason to buy more tools!
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Junior User
Joined: Feb 2011
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From: Cherry, Il
Where do you put it at post filter? Mine is in the little plug in the back the test port I took out and its in there
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Senior User
Joined: May 2010
Posts: 174
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From: NE Arkansas
I just put my FRx on this past weekend and used the GOLD spring. Truck runs fine. Those two square head plugs are pure H*** to get out! I also done the HPX, nice to kill two birds with one stone while things are apart...........
Cargo Master
Joined: May 2010
Posts: 3,047
Likes: 10
From: Snohomish, WA
There are two test ports in the fuel bowl. The one on the drivers side (easiest access) is pre-filter, the one at the bottom on the passenger side is post filter (pressure the heads see).
Posting Guru
Joined: Jul 2008
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From: Dalton,Ga
Yes it is, i just changed mine to post filter and used the plug on the pre filter side..
Cargo Master
Joined: May 2010
Posts: 3,047
Likes: 10
From: Snohomish, WA
Just use the plug you remove from the other port. Any #4 ORB plug or fitting will work, they are 7/16"-20 threads.