My 96 E300D has suddenly died. It starts, revs momentarily and then immediately shuts down. After a few seconds delay, trying to start it again will do the same thing... again and again. Continued cranking on the starter will cause the occasional cylinder to fire and make me feel optimistic, but it will never actually start. I have checked the 40 relay and the fuel cutoff valve, both seem good. The relay clicks and the COV opens momentarily when the key is turned to on. I had the dubious idea to manually turn on the cutoff valve with a couple of jumper wires to the battery. The engine started right up and went to full throttle (Very exciting). Hasty removal of the jumper wires immediately killed the engine. The cutoff valve was replaced about a year ago. There is no air in the fuel and I'm using an inline electric fuel pump that is providing 7 psi to the fuel system. I can see lots of fuel flowing through the lines and filters. All the filters have been replaced. It went from running very well to completely dead. Any ideas would be greatly appreciated.