Hi Ron,

AFAIK, the MB Diesels have a fuel valve that is controlled by a vacuum
hose that runs to the ignition lock. The problem could be with the
valve, the hose, the ignition lock or the vacuum in general. I think the
valve that shuts down the fuel supply is the most likely candidate.

You'll get lots of advice here. In fact, I'm sure someone will correct
my post any time now. I (also Dutch) have a 250D but I've never had any
vacuum problems yet. Fingers crossed.

Ximinez

Classic symptom of either a vacuum leak or failing shut down device
(vacuum powered bellows on the old cars, I suspect the same on your
model). Vacuum leak in old cars is often in door locks - sufficient to
prevent engine shut down - may also be so in your model IF it uses a
vacuum powered central (door) locking system.

There's probably a STOP lever on the engine's throttle linkage that
you'll soon need to use so take a look for it now rather than some dark
night.

I think this is OM603 motor, and the door locks are not controlled by
the same vacuum.

On top of the injection pump, there is a round "bell" (sort like a
smaller bike bell).  It has a vacuum tube attached.  Disconnect the
tube.  Use a vacuum pump to draw air from the "bell".  It should hold
vacuum for at least 30 seconds.  If not (most likely), this fuel shutoff
diaphragm needs replacing.

If the diaphragm works fine, you need to trace the vacuum route.  Does
the climate control work fine?  And power brake?  If both fail, then it
is likely the vacuum pump (front of engine, same axle as injection
pump).  This pump is not like the old one on OM617.  It cannot be
rebuilt and is quite expensive.