Fuel Injection Pump
All engines use the same type of injection pump, though 5-cylinder models have one more pump element. Turbo models have a connection from the turbocharger to the altitude compensator which allows that unit to enrich the mixture during boost operation.
The vacuum shut-off unit stops fuel delivery when the key is turned off. If it fails, a manual "STOP" lever is provided on the side of the pump. A mechanical fuel pump draws fuel from the tank and supplies it to the high pressure section of the injection pump. The pump is lubricated by engine oil.