Well it seems like you are out of options to try to get the pump to work while mounted on the engine
The only other thing that comes to mind that will cause no fuel to the injectors is that the plungers are bottomed out and stuck in the rotor(a drop of water in there will do that), if that is the case then i am afraid the pump needs rebuilding.
Normally the transfer pump on back of the Pump pushes fuel between the plungers and forcing them out against the stationary cam ring, rotation of the rotor forces the plungers by way of lift lobes in the cam ring towards each other and forces fuel trough the rotor to the injector that corresponds with one of the exposed orifices in the head.
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Today's Featured Article - Farming Never Left My Blood - by Stan Gordon. I was born in 1947 youngest of ten of a working farm. Our farm was located in Saskatchewan near Saskatoon. We had a mixed farm consisting of grain and dairy all done with old machinery and by hand. My dad had a tractor, a Farmall A which was used mostly to run the thrashing machine, a seed drill and for plowing. I remember locals used to help each other and threshing was done from daylight to after dark, one farm to another until all farms were done.
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