The only vacuum to a 79 240D injection pump would be for the shut-off diaphram. Not much needed in the way of a diagram. Just hook vacuum to the diaphram any time you wish the motor not to run. All of the rest of the time there is no need for vacuum at the pump.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician