So, following the Vac diagram above, I followed the Brown/Blue vac line under the airfilter housing and at the first Rubber Connector(Drivers side between headlam and brake booster) I seperated the joint and attached a Vac pump.
Started the engine, and applied Vacuum..... the motor stopped!
So, I assume the Vac stop valve on the Injection pump is good(It held vac too).

I then pulled out the Instrument cluster and followed the line to just above the ignition switch. I pulled the connector off there and applied a vacuum.
The Pump lever moves.

What next?

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2009 Mercedes ML320 Bluetec