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Remove the injection pump from the engine and validate that the pumps 'control rack' from the governor hasnt become 'frozen' in the closed position. Frozen control racks on injector pumps usually indicate and require that the injection pump needs a rebuild or replacement.

You can also sometimes do this check by taking off the cover plate for the governor and inspect to see if the governor-to-control rack linkage is able to move as if the rack is stuck the governor linkage will also be stuck - the governor linkage is directly connected to that 'control rack'. If not able to move, then most surely the 'control rack' - the rod that controls fuel volume flow in the injector pump - is most probably 'stuck'. Sometimes, checking a 'control rack' is easier to do than removing the Injection pump and all its 'piping' and removal and disturbing all the 'shims' used to gain precise 'fuel timing' - just check to see if the governor to injection pump 'rack' is free to move. On most small diesels you'll have to remove the governor linkage from the pump to remove the injector pump, anyway; so having that governor plate off will make it easier to remove the linkage from the injector pump.
Dont do this without an 'exploded view' line drawing diagram of the engines hi pressure pump and governor, etc.
 
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