Compression Ignition Addict
Join Date: Mar 2012
Location: Sugar Grove, N.C.
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Is everyone sure about this? What about all the "shimming the FPR" mods? The target there is 75-85 according to what I've been finding on some other enthusiast sites. There are also references to F6TZ-9K061-AA which is a replacement spring and such from Ford known as the California kit which does the same thing. It is shown as original equipment on Cali trucks which mine is.
What say the group?
Ok..if i remember (its been a while) correctly, min. pressure should be maintained at 40psi under all conditions. So even at idle or under full load you should have 40psi or more. Anything less is risking damage to the injectors (even though many of us, my self included have been under that number for one reason or another). Now, with 40psi you may or may not have 55-65psi just reving the engine under no load. Some people will upgrade the pressure relief spring or install a BB to raise that pressure. Here's where it gets interesting...International recommends no more than 70psi because above that you risk blowing lines and orings. Several (including myself) have blown fuel lines by "shimming" the fuel relief a bit to much. To sum up...you may or may not experience these same results but at anything over 70 psi i would be parking the truck til i could get things in check. At anything under 40 psi, i would be parking the truck til i could get things in check. Keep in mind...injectors and injector orings are expensive ventures either by way of labor or purchase price or both. A blown fuel line 50 miles from home is inconvient to say the least and may also get expensive. Also, if i saw a strange reading, i would double check with another gauge just to be sure i did have an issue. I would also assume that there may be air in the system (if fuel can leak out, air may get in) which could also cause some wierd readings. As per my original recommendation...i would let the truck sit til the new pump is in...then make sure all the air is out of the system and then recheck the pressure. I relly feel like the pump is the main issue...but if not, i would think checking/repairing the pressure regulator assembly would cure the problem. So, in response to your question...could you safely run 75-85 psi fuel pressure? Possibly, but 60-70 is plenty on these trucks. The main thing is to be sure you are maintaining atleast 40-45 psi under full load (say on a long hill, full throttle at 2500-2800 rpm's).
Psalm 34:6 "This poor man cried, and the Lord heard him, and saved him out of all his trouble."
2006 F350 cc/cc, 230,000,
4" turbo back exhaust, 35/12.5/18 tires
zf6, bench seat so my honey can get close!
Wifes Ride...2003 Excursion, 6.0, 4" turbo back, SCT tuned, 285/75/16 tires.