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Took the whole IP apart to replace O-rings and check for problems...when I put it back together I did so 180-degrees off. The alignment marks on the input shaft will turn TWICE for every grooved tooth alignment on the HH. Which makes sense: the HH needs only be aligned once every two rotations...

Thanks DH, I left this up in hopes of serving as an aid for the other threads that ended with no resolution. It starts becoming obvious when everything is working perfectly up to the injectors, especially on a low-mileage great-condition motor (mine hasn't been run very much in the past 10-12...

Yes, it was all functioning correctly; when I dismantled it to put in the new O-rings, I made sure all these things were cleaned up & working correctly. I just didn't bother to mention it in my too-long post above. Thanks for the tip!

I AM A TOTAL DING-DONG. Doghead called it; I had to step away for about an hour while I cleared my mind & tried to calm down. Then I went out & checked for TDC when all the alignment marks were lined up again. IT WAS 180-DEGREES OFF. DOH!!!!! :shock: :oops: aua So, once I confirmed TDC...

I've got a LDT-465-1D motor. I've replaced all filters & fluids, then decided to replace all fuel lines since a couple of the nylon ones were cracked. I've drained my fuel tank, cleaned & flushed it, cleaned the in-tank lift pump & replaced the rubber fuel hose on it with a brand-new one...