The 4 barrels are at the same height now bit the forward plunger is still not dropping low enough to reach the fuel feed ports in the barrel. I've tapped on this plunger several times after rotating the engine/pump. No luck getting this one to move. The other three plungers seem to be dropping down low enough to get fuel but I do pump any fuel to the injectors.

Is it possible a bad diaphragm or vacuum pump could cause a no-start condition?

Could the rack/control rod be stuck in the no fuel position where the plungers would be rotated to not deliver fuel to the injectors?