Too much fuel pressure?

[powerstroke 825]

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?

[ZMANN]

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

[powerstroke 825]

Ok thanks for the quick response! Not that i dont trust ZMANN but keep the answers coming i always like having more than one!

[ZMANN]

Ohh no offense

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

[PGreenSVT]

80psi is the generally accepted upper limit as I recall so you are ok there. That's where mine is at the moment too.

[H10F250]

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.

[lenzhotrod]

International Specs are 70PSI max.

[PGreenSVT]

Originally Posted by H10F250

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.