Too much fuel pressure? - Ford Powerstroke Diesel Forum
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post #1 of 8 Old 07-10-2012, 09:18 PM Thread Starter
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Too much fuel pressure?

Can you run too much fuel pressure? The reason i ask this is because I was told to run 65PSI with my injectors (175/75) and being that i set my airdog at about 63 and jammed the nut back. Well i have drove it for a little bit now and it seems that my pressure has creeped up to about 75PSI! Is this bad or should i just leave it?

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post #2 of 8 Old 07-10-2012, 09:21 PM
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u can run too much and the orings won't appreciate it but 75 is about the upper limit and I would say your ok there

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post #3 of 8 Old 07-10-2012, 09:34 PM Thread Starter
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Ok thanks for the quick response! Not that i dont trust ZMANN but keep the answers coming i always like having more than one!

2008 ccsb F250 lariat
SCT tuned by Gearhead Single 371, MPD CCV RCD pushrods ARPS

SOLD!2003 f250 4x4 crewcab lariat (03 Turbo)
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ARPs, 175/75 Industrial Injection, EGR delete, 5" MBRP,6.4 Banjo Bolts, Coolant filter SCT Innovative Xtreme X, PHP FICM tuner, AirDogII with Sump
2.5" level, 18" monsters with 33/13.00/18 Nitto Terra Grapplers
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post #4 of 8 Old 07-10-2012, 09:37 PM
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Ohh no offense

I just reiterate what I read ,, the more input the better !!

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post #5 of 8 Old 07-10-2012, 10:11 PM
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80psi is the generally accepted upper limit as I recall so you are ok there. That's where mine is at the moment too.
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post #6 of 8 Old 08-07-2012, 07:40 PM
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Glad to see the answer from PGreenSVT. I thought 75 was the limit and I just noticed 80 on my way into work tonight. So now I'm on here looking for what to do when or if it gets over that.

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post #7 of 8 Old 08-08-2012, 06:01 AM
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International Specs are 70PSI max.
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post #8 of 8 Old 08-08-2012, 06:23 AM
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Quote:
Originally Posted by H10F250 View Post
Glad to see the answer from PGreenSVT. I thought 75 was the limit and I just noticed 80 on my way into work tonight. So now I'm on here looking for what to do when or if it gets over that.
Yeah well my fuel pump also quit on me leaving me stranded 7 hours from home since this post. This is my 3rd pump in two years and I am now of the opinion that the DF-165 is just not capable of sustaining that high pressure over time.

I had to buy a new pump to get home and have since ordered a Fuelab 41402 High Pressure Pump and 51501 FPR that I will be plumbing into my system as soon as they arrive to handle the High Pressure duties. The DF-165 will be dropped to 15-20 psi and relegated to feeding the 41402.

Some vendors have stopped selling the DF-165 as a HP pump due to the failure rate. At this point I can't really recommend them anymore either. The AD-100 and AD-150 are fine to use as feeder pumps and have been reliable in that role. For HP pumps I suggest the Fuelab or Aeromotive pumps at this time.
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