FRx kit, which spring should i use??
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Senior User
Joined: Feb 2007
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From: Nanaimo B.C. Canada
FRx kit, which spring should i use??
hey guys, installing my FRx kit, it has 3 springs, silver=58-61 psi, gold=62-65, or black=67-70.. witch one should i use?? my truck is pretty much stock other than the usual goodies..
Cargo Master
Joined: Feb 2010
Posts: 2,298
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From: Delta, CO
I used the gold one & I really can't give you a good reason why. I do know that I hooked up a mech gauge after installing it & I've got 63psi, so the springs must produce the advertised pressures.
I believe I read somewhere that most folks use the gold one so that might have been what made me use it. I don't believe you could go wrong with any of the 3 but that's just my opinion.
I believe I read somewhere that most folks use the gold one so that might have been what made me use it. I don't believe you could go wrong with any of the 3 but that's just my opinion.
Super Moderator
Joined: May 2004
Posts: 29,380
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From: Central Coast of CA
Clay suggested I use the gold one. So yesterday, when Petey helped me install it, that's the one that was installed.
Stewart
Stewart
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From: Nanaimo B.C. Canada
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Lead Driver
Joined: Sep 2010
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yup, think i got the "colors" messed up when posting, from the corresponding #'s, i "remember" reading.
I'm looking for the spring to put me into the low/mid 60's psi...
I'm looking for the spring to put me into the low/mid 60's psi...
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Lead Driver
Joined: Sep 2010
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not to mention, they're 15 buks a shot ,but like what franko gots goin on, the "gold" should read 62-65-ish correct, but yet, he's banging at 75psi?
I need a low/mid spring to install onto the fuel bowl, so when i switch pumps to run wvo, the veggie pump can overcome the pressure of the D2 pump psi, but yet have my truck still perform correctly if/when i switch back to D2.
My ? should be, what is the stock fuel psi with no FRx.
I need a low/mid spring to install onto the fuel bowl, so when i switch pumps to run wvo, the veggie pump can overcome the pressure of the D2 pump psi, but yet have my truck still perform correctly if/when i switch back to D2.
My ? should be, what is the stock fuel psi with no FRx.
Lead Driver
Joined: Jun 2003
Posts: 8,298
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From: Damon (South East Texas)
I would say post filter port (lower on bowl) is better, since it will be the pressure the fuel rails will be seeing. If filter is new, you won't really see a difference.
Posting Guru
Joined: Jan 2007
Posts: 2,364
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From: Gilbert Az.
not to mention, they're 15 buks a shot ,but like what franko gots goin on, the "gold" should read 62-65-ish correct, but yet, he's banging at 75psi?
I need a low/mid spring to install onto the fuel bowl, so when i switch pumps to run wvo, the veggie pump can overcome the pressure of the D2 pump psi, but yet have my truck still perform correctly if/when i switch back to D2.
My ? should be, what is the stock fuel psi with no FRx.
I need a low/mid spring to install onto the fuel bowl, so when i switch pumps to run wvo, the veggie pump can overcome the pressure of the D2 pump psi, but yet have my truck still perform correctly if/when i switch back to D2.
My ? should be, what is the stock fuel psi with no FRx.
Jim & fat Monty
Molon Labe
Joined: Dec 2006
Posts: 5,272
Likes: 1
From: Alaska
I rebuilt my fuel bowl today, and upon reassembly I lost the gold spring...
So I put the black one in. Now I have 76 at idle.
I did find the gold after I hosed the valley out.
If its too high, I'll switch back to gold.
So I put the black one in. Now I have 76 at idle.
I did find the gold after I hosed the valley out.
If its too high, I'll switch back to gold.
Lead Driver
Joined: Sep 2010
Posts: 7,793
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Franko, i got the first gen FRx, and for 5 months it would stay a consistant 69/70psi, all day long, however then, the last couple months, it krept to 75/76psi, and thats when the #8 knock/tap sound was intense. At one point, after towing my trailer (8k at the time), rolled into driveway and sounded as if i had someone under the truck with a ball ping hammer, banging away...i since then, removed the fpr assy, wet-sanded the plunger, clipped 1-coil off the stock spring, and walah, back to 69/70psi, and run'n the FRx. Gonna this week though, remove it and instasll the stock FPR, and we'll see then.