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Also if you turn the engine over by hand you may see that more than one are stuck.

i thought the same thing but no luck with mine. Injection pumps have extremely tight tolerances. No room for the smallest bit of rust on the plunger.

That is what mine looked like. That plunger stuck will not allow the rack to open so no fuel. I was not successful at getting mine unstuck.

That was my problem. The shutoff works by moving the fuel rack. Mine was stuck because one of the plungers in the injection pump was stuck. It only had a tiny bit of rust on it. Ended up replacing the pump with a new one. The comment about the gear torque being too high is right. I went...

Fuel will only come out there while cranking the engine with the throttle open. Fuel should not come out of there while pumping the primer pump.