Hey guys, I posted this question on another forum, but it seems to be dead there....
1990 w250 12v 5.9 5spd 350k miles
has fuel screwed turned in 3/4 turn, FSS gutted, 3200 gov spring, piston lift pump, hx35, fuel line is ~1yr old, ~2yr old DAP 5x12(i think) injectors, original injection pump, filled up with fuel about 20 miles prior(was at 1/4tank).
Driving home the other night I had to drop someone off, pulled in and shut the truck off. It restarted fine, pulled out of the driveway in 2nd gear, hammered it a little, and went for 3rd gear. When I pressed the accelerator pedal there was no response at all so I crept up the road as far as I could at idle speed in 3rd and pulled off the road. At first I had thought the throttle linkage fell off, so I shut the truck off and went to check. Everything looked fine, got back in and tried to restart, but it would only crank and not fire. I then flat towed it home with my cherokee
. The lift pump is pumping plenty of fuel, the fuel is getting to the pump (removed FSS and primed pump to check). I pulled the oil filler neck and confirmed that the timing gears are spinning when cranking. I tried bleeding cyl 2,3,4 injectors, cyl 2 and 4 didnt even get damp, cyl 3 got slightly damp, So it seems to me that the injection pump is getting fuel, but not delivering it to the injectors. Is this a common way for the pump to fail? Am I missing something else in the circuit? The onyl other possibility I can think of is that the front seal of the pump may have blown out, but I dont have an obvious amount of diesel in my oil. I want to pull the filler neck again and try to look with a mirror to confirm that though. No, my manual shutoff is not "shut off". If it is a pump issue, Where would you guys recommend getting one? I want to call around for rebuild pricing, and from what I read, I want to stay away from parts store reman units. Pennsicola Diesel has a "rebuilt with Bosch parts" pump available for about 700, but I vaugly remember reading to stay away from that vendor? Any help is appreciated!
Thank you,
Jake