So...let's start from the beginning...
I've got an '02 24v HO Cummins with a 6 speed manual, before the problems started it had a Valair clutch, 80hp injectors, Edge Jw/A, and an S&B air intake.
I had been watching my guages on the Edge monitor and the fuel pressure at the VP44 was getting really low, so I started looking at an aftermarket lift pump to deliver some extra fuel to it so it wouldn't overheat and go out. At the time, the Airdog II had just come out and had tons of great reviews, so I bought one.
Installed the Airdog II, and everything ran great for a week. Then, heading off from a stoplight doing 15 mph, the truck backfired twice, hard enough to blow the y-pipe for my stacks out of the rest of my exhaust, and died. Would not start afterwards.
Tried getting a local diesel shop to help out, dummy ended up cutting a bunch of wires to the programmer and Airdog, big mess. Airdog finally decided to answer the phone after a month and realized they sent me a jacked up pump and sent me a new one.
After the new pump was installed, we were able to get it fired up, but couldn't keep it running for more than 1/4 mile. Local Dodge dealership in town tightened the injector straws and it ran pretty well after that, but intermittently had a hard time starting.
Then I moved 600 miles away and on the way to my new home I was towing a trailer with a half-ton Ford and I was doing good for the first half, even getting 18 mpg. Then it dropped to 15, then 13, then 12, and so on. At the half-way mark I went to get off the highway, shifted into nuetral on the off-ramp, truck dies, takes three hours to get it started again. Stopped for the night, fired right up the next morning no problem. Made it 30 miles away and it died again when slowing down for another stop. Had to bleed air out of the injector lines to get it started again.
Every now and again while going down the highway the truck would pretty much act like I didn't have my foot on the accelerator at all and would slow down and act like it would die and I'd have to put my foot to the floor until it picked up again. The last 45 miles of the drive was nothing but steep, steep hills, and every time going up a hill the truck would try and die. I don't know how in the world it didn't.
I figured I had to be pulling air from somewhere and hooked up a nitrogen smoke machine to it the other day, and smoke was leaking like crazy from the gas cap. Replaced the gas cap, couldn't find smoke coming from anywhere else, and the truck started up no problem. Made it two miles up the road, went to turn around, and the truck died. Got it to start up by bleeding air from the injectors again, and made it back to work, but it tried to die a couple times on the way there.
Any ideas?

 

Damn shelbs that big guy just won't stop giving you problems huh? Do you still have your air dog return on the filler neck?

 

sounds to me either like you are getting air or the connection to the vp44 is lost while driving it draining it of fuel, when you bleed it does it have air before the injection pump or only after?
the dead pedal is another sign of a bad vp. mine would not rev then started idleing like crap and would die. start back up after bleeding then run for around 30 mins or so and start over.
so sorry to say but it sounds like your ip is trying to die. also mine did not throw a code when it did this so everyone said that it could not be the ip but it finnaly would not start no matter what i did and then threw the code finally.

 

Jake, honestly I don't remember if we left it there or if we did it Larry's way. I think we did it Larry's way.
I've thought a lot about it being the vp, but like yours, mine doesn't have any codes right now either. Most often it has air before the ip, but we've been able to get it started just by cracking the injector lines.
I let the smoke machine run for quite a while after we put the new gas cap on and couldn't find a leak anywhere. It always idles fine once it gets started up. I am really considering that it could be the vp44 tho, but since there's air behind it, then I'm also considering that the Airdog is a huge hunk of crap. Still.

 

Did you install the draw straw that came with the ADII?

 

Yep, it's all in there

 

Maybe the return still?

Or the return on the vp is starving it for fuel? Stuck wide open?

 

i bet something in the tank with the draw straw fell apart or is having issues it happened to me i dropped the ttank removed all the little plactic lines they gave me connected from the bulkhead to the bottom of the tank and replaced it with 1/2 inch fuel line and used true clamps to clamp everything together to prevent a leak and now it runs like a champ i also clamped every spot where i used the barbs to shorten air dog lines hope this helps!

 

We had the same problem with old setup and new setup.

Maybe try taking the return loose and make sure the tank is full and have the return dump into a seperate container and see if the problems alieviate. If so the return is still the issue. Maybe where its at its still airating the fuel. Your vp could be shot too though, sorry shelbs

 

Did the same thing but did it at install. Dont have an ADII though. Just have a regular AD100. Hope you get it figured out. Truck just might be mad you left WY for OK jk.