Try cracking the lines at the valve cover and then try running with either for a few revolutions . Now if you see diesel it should run , sometimes air will get in the lines and be too spongy for the pump to purge it out .
Been through this process 2x, good flow to each injector. Is it possible fuel rack in the injector pump is only opening part way? The kicker is that it did start then died, cracked fuel line? But no air when I crack the purge on top of the injector pump or the lines at the injectors.