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Yes, you would think a rebuilt pump would be tested, etc. but HH piston is not rebuildable, yet. To see what I mean take all injector feed tubes off of HH and turn motor over. If fuel is not shooting over a foot high out of holes in HH, start up speed fuel pressure is too low to get fuel to...

If she runs OK once you get it started but is hard to start, I found the HH pressure to the injectors is too low because its single piston is no longer able to get pressure up high enough at the low starting RPMs. This is caused by a slow wearing away over time when fuel is not very, very...