Well things just went from interesting to much worse... Raptor died, VP as well.

[dripley]

I's say 40 is a bit to much. I know when I adjusted my ADII I seem to remember it adjusting backwards to the way I thought it shoul adjustt. Did you try adjusting the screw both ways? By the way the ADII adjusts like your raptor. You dont have to swap springs like the AD 100 and 150.

[FlatTwin]

Dave,Thanks and yep, ran the adjuster screw all the way to the left (counterclockwise, which should be lowest pressure) and to the right (clockwise, high pressure) and no change what-so ever...

[dripley]

Sounds like its time to call AD.

[FlatTwin]

Tried and it went to voice mail. Guessing they are at lunch so waiting an hour...

Joe

--- Update to the previous post...

Well, three hours later and still no return call from Pure Flow.

Took the truck on some errands and it drove just fine. This is with the original VP on it and with 40 psi pressure.

While driving the pressure varies but usually around 37 to 39 or so, and WOT goes down to 32 but otherwise runs fine.

Anyone know if its ok to keep driving like this? Am going to replace the VP anyway but not today. Its 112 degrees today and just too damm hot to be out there in the sun...

Thx, Joe

[dripley]

What kind of pressure gauge do you have, mechanical or electric? How is it connected to the fuel system? Could be your gauge is toasted form VP pulses. Here is a quick read. http://articles.mopar1973man.com/general-cummins/36-fuel-system/34-fuel-pressure-gauge-and-water-hammer-effects When mine went it just pegged out at 30# and did not move until I cut the egine off.

[FlatTwin]

An "Edge w/Attitude" system is what I am using for fuel pressure along with other readings.Had it a couple of years and always worked fine and was accurate as far as I know.

[volkswagon]

Tried and it went to voice mail. Guessing they are at lunch so waiting an hour...

Joe

--- Update to the previous post...

Well, three hours later and still no return call from Pure Flow.

Took the truck on some errands and it drove just fine. This is with the original VP on it and with 40 psi pressure.

While driving the pressure varies but usually around 37 to 39 or so, and WOT goes down to 32 but otherwise runs fine.

Anyone know if its ok to keep driving like this? Am going to replace the VP anyway but not today. Its 112 degrees today and just too damm hot to be out there in the sun...

Thx, Joe

Why would you change the vp if it's still working? Before I learned what I did here about fuel pressure I was driving around with near 0 psi. When the lift pump crater'd all together I drove it an hour home and it was bucking the whole way and sometimes only had power to go about 40. That was almost 2 years ago and my vp hasn't missed a beat yet.

Sent from my iPhone using Tapatalk

[flagmanruss]

I was lucky. When my OEM lift pump went out... I stopped suddenly... but the VP44 has survived it.

[FlatTwin]

Ted, What concerned me enough to get a new one (its here right now) was the smell that the current VP was making after I got the truck home and shut it down. Strong electrical smell along with "I am hot and not happy with what you are doing to me" smell. If you have ever had any electronics really hot you know the smell and thats what I had, so lost confidence in the unit on the engine right now and went ahead and ordered a new one to swap out. Have talked with several injector pump people and the biggest thing that they stress is that the VP44 does not like heat cycles, and heating them up does wonders to the circuit board on the pump. Evidently thats one of the biggest things that cause the pump to stop working, not a problem with the internal guts of the pump.I would rather spend the $1000 and get a good overhauled unit and swap it out right now than get stuck by the side of the road somewhere in the near future. If I am wrong then at least I did the best I could to get a reliable situation. Part of the problem is that I am a aircraft mechanic and we do not have the option of re-doing things most of the time, it simply has to be correct the first time it goes out, and that thinking extends to my cars even though they never take off! :)Thx, Joe

[volkswagon]

Ya I think you made the right choice with smells like that coming from the pump! I guess I was mighty lucky mine survived. Sent from my iPhone using Tapatalk