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Glad you got it going! These pumps definitely have their oddities! I must say, your ordeal just goes to prove what ive said for years... Fixing old stuff is 50% undoing nature and time, 50% undoing the previous owner.

The deuce fuel system is pretty much self bleeding. Even a substantial air leak wont keep one from trying to run, and nothing but an open and drained line will stop it from flowing at least something. You are not getting any flow through the last stage of the pump, either due to the most...

Sorry if you've answered any of this before but... have you confirmed fuel is 100% getting to the injection pump inlet in good quantity? Do you get any fuel even drooling out of the delivery valve hole if you crank it with the dv removed? when you changed the HH, has it been full of fuel? If...

Have you confirmed that the plunger is actually moving / that the entire pump is actually spinning? Weve been through most of the normal and less normal stuff it seems, perhaps the pump cam is worn out, or the pump seized and broke its shaft? The plunger can be accessed through the center cap...