thanks for the advice rrgrassi.

I'm not too terribly (read: not at all!) knowledgable on the mercedes vaccuum set-up. I took this 616 motor out of a wrecked 240D, leaving everything behind the firewall behind when it got picked up. So, I do not have and am not sure where the "shut-off valve" is. I mean I know what a shut off valve is, but just not the one specific to the mercedes vaccuum set-up.

What I have now is a 616 with a bare fitting on the top of the fuel solenoid shutoff waiting for a vaccuum line to bu plugged on, and a 'tee' off of the main line coming off the vaccuum pump going to the brake booster. I'm not sure how such an electrical switch gets wired up and plumbed up to the vaccuum system. Is there a vac line going in to the switch (from the main booster line), a vac line coming out of the switch (going to the fuel shut off on the IP), and the switch itself having a 12V source?

After not knowing the internal mechanics of the fuel solenoid shut-off on the IP, all in all how do I successfully and simply get to... "making sure the vacuum to the shut off valve is released after the engine stops"

By shut off valve, can that be translated to fuel solenoid shut-ff (as on the back of the IP)? Isn't this vaccuum actuated solenoid shut-off the only thing that actually shuts down the motor by cutting off the fuel supply?

Thansk