Engine/Transmission (1998.5 - 2002) Air Dog 150 Too Much Pressure

[tmpenner]

I installed an Air Dog 150 with a Draw Straw V returning fuel to the factory fuel suction straw using a dorman adapter for 1/2" lines. Problem is that when I finally got my X-monitor fuel pressure gauage hooked up, w/ a T in the line, I am showing pressure from 32-36 lbs. The unit is suppose to be set at 15 lbs from the factory and they included an extra spring in the kit. Did I miss read the instructions and need to change the spring in the return line or does anyone have other ideas? Am I going to hurt the pump with higher pressure?Thanks.

 

[Cummins724]

Sounds like the factory return can't take the fuel fast enough. I would run the line as Airdog suggested, going back to the filler tube.

 

[CKelley1]

i think you just helped me solve a problem. i just got a raptor150 pump for a 01 this is the pump on the airdog it did not say anything about a return line and we have been trying to turn it down all day . it would not move from 75 psi. was going to call raptor monday

 

[waltk]

That pressure is way TOO much for the VP-44 (yes too much pressure is bad as well, what a great pump... #@$%!), It really should not be more than 15-20 depending on year. 15psi for you I believe.

 

[monkeyman]

If you run that much pressure say goodbye to the VP44, Maximum pressure should not be over 20PSI, I run 18, ran higher and blew a pump once
Rick

 

[Cummins724]

If you run that much pressure say goodbye to the VP44, Maximum pressure should not be over 20PSI, I run 18, ran higher and blew a pump once

Rick

I've been running 24psi for 6 years now & I have not had a single issue. My brother was running 30psi for a while with no issues. I don't suggest going over 24psi myself, but there are many guys out there proving me wrong every day.

 

[monkeyman]

Just a heads up, I ran 30psi, took about two years to blow it. VP can't handle and does not need that kind of pressure. When I took it apart, I saw the damage.
Rick

 

[ALepley]

Holy smokes thats wayyyyyy to much pressure. Factory lift pumps only supply 9-10 psi to the vp44. I would definately do something about that. You vp44 is going to go out sooner or later. It is not made to handle that pressure.

 

[MHoehna]

any thoughts on how to reduce the pressure? I installed an in-line pump in front of the tank due to LP pressure being low. Maxed out my gauge (30 psi) when I started it, need to back it off somehow... any ideas would be helpful, and no money for a FASS/airdog...

 

[Cummins724]

Adjustable regulator. I have a few regulators here that came with holley blue pumps. PM me if you need one.

 

[tmpenner]

After a little investigating, most of my problem was a restriction in the return line. I planned on running the fuel back through the original fuel supply outlet via a dorman adapter as recommended by the Draw Straw V instructions. What I didn't realize is that there must be a check valve and the original suction straw needed to be cut to allow the fuel to flow back. This dropped the pressure to 22lbs. I then cut a coil from the relief valve spring on the Air Dog which dropped the pressure to 18-19lbs at idle. I am going to run it there for now.

 

[ESwartzer]

Pressure

18-19 psi at idle is near perfect . maybe just 2-3 lbs on the high end. I put in the Airdog 150 about three years ago and the pressure was 26 lbs from the factory . I installed the lighter spring and it only held 11 psi. so i pulled the lighter spring out and stretched it a little bit untill i had at a perfect 16psi at idle !