Tyofwa

An update and thanks... I reassembled the fuel system last night. Along the way I verified the return valve worked. Then the fuel filter, and it was clean. I swapped out the fuel relay with the spare.. So far all components working. Before hot jumping the VP44, I wanted to bleed the lines. I got fuel to 6, then 1, then 5, then 2. 3 & 4 would not bleed. I loosened them even more and watched as my son cranked for 10 second intervals. As I saw fuel and green bubbles emerge from the remaining lines, the truck grunted! After securing the remainder, the truck started with little trouble. My my working hypothesis is that low fuel caused this condition. I was at 1/8 of a tank that day, and had to hard-accelerate on to a highway from an unlevel approach road. Between idling waiting for an opening and the hard thrust on to the highway I must have created a large air gap in the lines. The stall occurred 5 miles later. As a side note, I looked at a new lift pump from FASS. The unit was exactly the same size and shape as my NAPA unit. Apparently the OEM Carter pumps are such crap, NAPA sells an Airtex/Delphi pump as the stock replacement. Looks to be from the same factory as the FASS. I tested my PSI while driving (not easy to do with the gauge sticking through the hood) and it read 16 psi under load. I'll hookup an interior gauge, but for now I'm sticking with it. I appreciate the assistance & effort from this community. Thanks Ty

@CUMMINSDIESELPWR - how do I check the check valve? Was that the part which came with the new pump? @Me78569 - is there a way to diagnose that before contacting the supplier? @Hawkez - I'll check the electrical connections and may add dilectric grease to the plug. Also, the lift pump was a different design from the OEM. The guy at NAPA said that the originals were crap and that this design was the same one used by most of the aftermarket suppliers. Here is a link: http://www.napaonline.com/napa/en/p/AFPE7153/AFPE7153_0397462450 Where I left things yesterdaythis I am ready to put a puller on the pump. Based on the recommendations in this thread, I may want to reassemble the machine and verify other components. At this point I am not sure if I should be relieved or disappointed that the keyway had not slipped. At least that would be proximate cause. Thanks everyone for your support!

Thanks for the feedback on the lift pump. Are you saying that my lift pump is proximate cause for my situation right now? I want to focus on getting it operational; I'm not opposed to swapping it out once I know what it will take to get the thing running.

Yesterday my wife and I were out running errands, heading home on the highway when the truck began to sputter, blow blue smoke, and then completely died. We got towed home and how I'm starting to diagnose the issue. Background - About 700 miles ago the truck was throwing a P2016 code. I installed a filter / new lift pump from NAPA, and a new VP44 from Pacific Fuel Injection in Portland. I also replaced the crank position sensor while I was there. The installation went well, and the truck drove with renewed strength; even towing a 10k RV trailer for over 350 miles. Here is what I know now: There are no engine codes throwing The VP44 keyway is still in position (see picture below; the angle was hard to shoot with my camera) The lift pump pressure is ~13PSI When I crank with the injector seats slightly loosened, I see fuel pooling underneath I began the process of pulling the pump believing that I receieved a bad unit. All injection lines are off the truck and I'm ready to pull the pump out. As you can see in the photo below, I was test-threading some puller bolts in preparation of removing the pump and attempting a re-seat. After getting a better look at the keyway, it is apparent that the key is indeed seated. So now I'm at a stopping point - Any assistance is appreciated. Thanks from Washington, Ty