Bobcat Kubota Diesel pump repair 

Sorry, I don’t know much about these engines. But when I pump fuel into a high-pressure fuel pump, once it fills up, excess fuel does run back through return line.

This is an air bleed valve. CC to open vent.

Shaft itself has four marks, and each gear has alignment marks. When I took it apart, I left one cylinder untouched so I can use it as a reference.

I don’t remember exactly so don’t take my word for it. But shaft/rack gear had 4 marks on it for each cylinder and cylinder gears had three marks, and I believe the one in the middle is the one that supposed to be aligned with the shaft mark.

I don’t know much about diesel engines. In my case fuel pump revs up and down and shuts the engine off.