Quote:
Originally Posted by resto108
There is no vacuum in a diesel intake manifold, that why there is a vacuum pump. You have to have a throttle to create vacuum.
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The OM615 is a bit of an oddity it does have a throttle valve controlling air going into the engine much like a petrol engine.
It certainly uses negative pressure in the intake manifold to control the "pig's bladder" (as it is often called on this forum) as part of the injection pump regulator / regulation. If this diaphragm breaks the tell tale sign is an engine that revs too high (but not run away).
I'm not sure what else is tapped off the intake manifold - best to find a workshop manual (which isn't likely to be easy unless you're prepared to pay Mercedes a lot of dosh)