OK, more food for thought:

OK, I'm not sure on the C Class about the fuel filter. My original train of thought was that on this, the fuel filter has the pressure regulator integrated into it, not 100% sure this is true or not.
***addendum: I see the filter was replaced (on above thread)--DID THE PROBLEM START when the filter was replaced????***

There is a component on the car which in a way substitutes what the OVP does. It's in the control module box, it's called the fuse and relay module (K40 I believe is it's identifier). It may cause this, it has the fuel pump relay in it, etc, helps distribute power to various control modules.

What probably should be done is a quick scan for trouble codes, and if nothing there the best next step would probably be to drive the car with a fuel pressure gauge installed and monitor fuel pressure when the car stalls.

Another possiblity (because stalling is rather rare on the M112 engine) is maybe the throttle motor (actuator).

Gilly

Gilly