Blue Spring/85psi
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Elder User
Joined: Feb 2004
Posts: 754
Likes: 0
From: Cedar Springs,MI
Blue Spring/85psi
Finally got around to adding a fuel pressure sensor to my Spartan Phalanx. At the time of install I upgraded to the blue spring. At idle I'm around 80-85 psi. Rolling down the highway at 75mph average 85 psi. WOT it dropped to 65 then returned back to 85psi.
Looks like I'm going back to the stock spring.
Looks like I'm going back to the stock spring.
Thread Starter
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Elder User
Joined: Feb 2004
Posts: 754
Likes: 0
From: Cedar Springs,MI
Install of the spring was pretty easy. Replaced brass cup and spring. Also replaced gasket in cover.
The only thing I question is the accuracy of my newly installed sensor. I'll have to look into calibrating it to be certain. Not sure if it's even possible.
The only thing I question is the accuracy of my newly installed sensor. I'll have to look into calibrating it to be certain. Not sure if it's even possible.
Hotshot
Joined: Apr 2010
Posts: 19,073
Likes: 243
From: Saratoga Springs,UT
I just put mine in and away I went I dont know the pressure but I do know Im not making oil scary I know
make shure the plunger and everything got to be sitting in there just right
i dont remember changing brass cup
make shure the plunger and everything got to be sitting in there just right
i dont remember changing brass cup
Senior User
Joined: Jun 2011
Posts: 383
Likes: 3
before you throw away the blue spring test the fuel pressure with a mechanical gauge at the test port....not at the cap or any other means....
if still too high I would just barely fuzz a little bit off the spring and reinstall to get the ideal psi....
if still too high I would just barely fuzz a little bit off the spring and reinstall to get the ideal psi....
Mountain Pass
Joined: Aug 2006
Posts: 128
Likes: 1
From: Okeechobee FL
Did the blue spring on mine last month when I did the oil cooler and BPD erg cooler. Mine went from 48psi to 75 psi at idle. Now after a month, it has dropped to 68 at idle and 65-68 at road rpm's. It DID slightly drop in pressure like numerous posters stated but holds very steady at these pressures. Very glad I did it.
Post Fiend
Joined: Oct 2009
Posts: 12,123
Likes: 35
From: N. Fort Worth, tx
you may not have gotten the spring seated in the cover correctly. I have seen this done before were it forced a pump to dead head pressures that pegged my 100psi gauge.
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Elder User
Joined: Feb 2004
Posts: 754
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From: Cedar Springs,MI
Bingo!!! Blue spring folded up like a cheap tent
Guess thats what I get for doing it by flash light in the dark. Back to the International dealer tomorrow.
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Hotshot
Joined: Apr 2010
Posts: 19,073
Likes: 243
From: Saratoga Springs,UT
this spring regulates the fuel pressure
low fuel pressure KILLS injectors
some have experianced low fuel pressure at WOT this spring just bumps the pressure up
The injector fires a plunger to inject the fuel the diesel fuel is the lube for the plunger you dont want to dry fire the injectors when fuel pressure is low
This is also the reason most people on here run diesel additives
I use the grey bottle of diesel clean from walley world
It goes here
Freshman User
Joined: Feb 2008
Posts: 33
Likes: 0
From: So-cal
right , I understand about the inj, dry firing, It's like Heads with out harden seats, the valves beat them up.
Kinda figured it was to bump up psi. just wanted to know what kinda probs, you've seen.
Thanks
And who has them that you recommend I buy from.
Kinda figured it was to bump up psi. just wanted to know what kinda probs, you've seen.
Thanks
And who has them that you recommend I buy from.
Hotshot
Joined: Apr 2010
Posts: 19,073
Likes: 243
From: Saratoga Springs,UT
Its always good to spend some time and do preventative maintenace
Take some pics
I am putting in that air filter in a few
Have fun Sean
I'm hitting easy street
Joined: Nov 2009
Posts: 6,395
Likes: 27
From: Central Oregon
Then, the wife's car needs some attention. Fun day tomorrow.