I have a 1993 300se 6cyl, over the past MONTHS it has stopped whilst driving. Initially it would go 20klms then gradually shorter distances.
When it stops it is like running out of fuel (firstly a stumble when accelerating, then gradually going from 6 to 5 then 4 cylinders and stalling). Fuel filters have been replaced twice and were clean (I cut them open), fuel pumps were replaced, fuel pressure regulator was replaced, the local auto club mechanic tested the ignition side and said its ok. The car will start again after about an hour or so, then repeat the stopping.
As I have other cars I haven't chased the problem hard but now my wife is on my back saying nasty things about my german girlfriend.
Does this sound like a fuel pump relay problem, or what do the informed members of this forum suggest?

Sure Sounds Like Pump Relay, Could Be Ovp Also

I agree with the Infamous OVP
Do a search "OVP" The item has been corrected with a redesigned part and you will know by the part# on yours...

I have eliminated the relay as a cause of the stopping using a new relay to no effect.
When you pull the relay whilst the car is running, it stops almost straight away. My problem takes longer to actually stop the car. This happens now after only two minutes idling! Just like it's running out of petrol-gradually it cuts cylinders out till it stalls.

Please help!

Just about given up on this car,I'm was determined not to let it get to me but I've no idea what the problem is.
Anyone out there guess?

Crank Position Sensor heat soak..
Check wire harness insulation..
Plug connectors under the coils.
I would also go in and get the codes stored , specially from pin #8...............