Sad but true it too late already... With your lift pump dow to 4 PSI your VP44 is toast...

Here is the lift pump diagnostics...
Lift Pump Diagnostics

MINIMUM PRESSURE AT WOT IS 10 PSI (Straight from Dodge's Factory Service manual!)




As for replacing the VP44 when it comes time...
VP44 Replacment

As for repriming the fuel system afterwards...
Reprime Fuel System

As for Vulcan Big Line Kit...
Vulcan Big Line

 

Im not sure if that is 100% true mopar man. Up around here i talk to alot of guys who do pulling that pull them down to 1 psi every time they pull and there vp's last quite along time. And if that is true that it needs 10psi mine would of been shot right after i bought it. Ive had troubles with my lift pumps every once in awhile and ran it down to 3psi for over 10 seconds and its been about 40,000 miles since then and still running good. Now don't get me wrong it will weaken it by running it that low but i dont think it would be shot right away like some say. I know mine is getting weak but it has taken alot of abuse in the last 140,000 miles but still is running good and havent had to many problems pushing out atleast 400 hp for the last 20,000 miles.

 

These VP's are a crap shoot. Some will die like right now and some will go forever no matter what you do to them. Myself, I put over 3000 miles on my original with no LP workin at all. When I installed the new LP the VP still worked fine for a long time afterwards. Ya I'm sure it shortened the life span that it would have lived but I got 150,000 out of it so no complaints from me. In talkin to Cummins Techs, even they say the manual allows for the pumps to be pulled down to 0psi for short durations because everything they work off of has to do with flow amounts and psi.

 

The kits are an easy install. They come with everything to bolt it right up. Under 2 hour install in my case and I don't work fast. I bought mine through Glacier Diesel but the original design of these came from Opie's drag trucks doing the research and development on them and his are marketed under the name of MITUSA (Made In The USA) Pump though a member here by the name of MikeL. Who owns and operates a tranny shop.

 

The information I provide is straight from the Factory Service Manual from Dodge! The min pressure is listed in there book. Other that that you can test by volume (TSB). In either case when my lift pump was getting weak 8-9 PSI @ WOT if failed both the pressure and volumes testing by Dodge FSM. dodge replace the LP under warranty. They want to change the VP44 but there was no signs of problems yet... 2 weeks later even though the new LP was 13 PSI at WOT the VP44 was dieing... P0216 and lots white smoke in mornings...

Not here to argue... I'm here to protect a very expensive piece on the great Cummins!

 

White smoke is a classsic sign of injector pump failure. You havent said whether or not youve checked for codes.

 

I already asked him to do that. I don't know if he did or not.

 

the only code i got when i checked it was the P0500 which doesn't mean to much since i know that my harness on the back axle is a little wore out. Changed the fuel filter to and that didn't fix the problem all the way but it helped out a little bit. I think im gonna order a Airdog 150 fuel system today. Has anyone used them and how do they perform compared to the $150 more FASS setup.

 

Now, how did you check codes? Did you just to the key on/off deal or did you actually scan the truck with a scanner?


From what Ive seen the AirDog is a kick butt system and is easily as good as a FASS.

 

I just turned the key on and off. but ill go hook up my smarty quick.

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Just pulled them up and got P1693 also.