Those engines don't have a fuel transfer pump and the injection pump is ''returnless'' and can be a real bugger to bleed the air out of.
Have you had the line fittings loose at BOTH injectors and cranked it long enough to get all the air out of the I.P.?
If you have good help and can do it safely, try ''pull starting'' it to give a faster cranking speed with some duration to the pull.
If none of this helps, something MAY have happened with the internal linkage from the governor to the injection pump ''rack'' so that the barrels are not being rotated to the ''full fuel'' position.
IIRC, I have heard of a pin in the internal governor-to-I.P. linkage falling out.
Any chance the engine got a dose of ''bad'' fuel/water, etc.?
That could damage/stick the plunger ''barrels'' in the I.P..
I do not know your level of experience with diesel engines, but I'm sure you are aware if you pull and injector you will need a new gasket, and to thoroughly clean the bore and seating area in the head.
If you are considering tearing into the injection pump and governor area you NEED a factory manual and good attention to detail BEFORE going there.
The internal linkage can be damaged if you try to remove the I.P. without first disconnecting it. Timing was set at the factory with a stack of shims under the I.P..
Probably check around FIRST with injection pump shops in your area to find one set up with the necessary fixture to mount your I.P. to for testing. (It is operated by lobes on the engine's camshaft.)
When you find a shop that can service it, ask if there's anything you should try/do first, before removing the pump.
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