Blue spring update
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Senior User
Joined: Aug 2010
Posts: 202
Likes: 1
From: FLORIDA
Blue spring update
Well....... finally i put in my new update fuel pressure kit in (blue spring)WOW my fuel pressure was 55 at idle and 49 WOT now it's 68 at idle and 62 WOT.I'm guessing it's that high because it's new.But ether way life is good now
Senior User
Joined: Oct 2002
Posts: 107
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From: Enumclaw USAAAAAAAAAAAA
I've got to ask. What is the reason for changing out the spring? Much better upgrade over stock? How do you know if you have an issue...I know newbie question...
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Logistics Pro
Joined: Mar 2007
Posts: 4,604
Likes: 4
From: Claremore, OK
The issue is over time the OEM fuel pressure regulator spring allows the pressure to drop too low...causing damage to the injectors. Anything below 45 psi is death to the injectors...the higher the better. But there is a such thing as too high (above 70-75 is too high). Thus you need to check the fuel pressure before you replace the spring or even adjust the pressure.
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Senior User
Joined: Nov 2009
Posts: 131
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From: Mead,CO
My local Ford dealer just soaked me for $100.07 for the blue spring upgrade kit. I asked if he could maybe sell it to me for $70.00 like all the others I've seen and got a resounding NO! So I proceeded to elevate my voice and quoted Bill Burr with "HOW BIG DOES YOUR*&^%$# YAGHT GOTTA BE?" So it goes, some people suck..............and some swallow. Going to pick up my new scanguageII Peace
Tuned
Joined: Mar 2014
Posts: 452
Likes: 2
From: Cheyenne Wy.
I ordered mine from psdparts.com on Saturday and received it today, $58.60 and free shipping. I will be installing it as soon as another project gets out of the garage!! I did try the dealer and they wanted $89 and wouldn't budge so I went the online route. 
Logistics Pro
Joined: Mar 2007
Posts: 4,604
Likes: 4
From: Claremore, OK
With cover:
Ford Fuel Pressure Regulator Blue Spring Kit w/Cover - Riffraff Diesel Performance
Without cover:
Ford Fuel Pressure Regulator Blue Spring Kit - Riffraff Diesel Performance
Senior User
Joined: Nov 2009
Posts: 131
Likes: 0
From: Mead,CO
Ok so I installed the kit. Took the boy and myself for a ride and we both noticed improved performance right away. Headin back from work yesterday and it seemed to slowly lose power all the way home. This morning headed to work( Yup on mothers day, yup it was snowing here in Colorado, and yup working outside) and comin home tonite I could barley keep it going 45 mph. Got home changed out new motorcraft fuel filters got a half a block away and it died. and wont start.... still gotta be at work in 9 hrs. any one got any ideas?