Chuck,
Can you tell me more about the fuel unit near the fuse box? I know you are relating from a 300D, but I couldn't identify the box. Size, number of wires on it, does it have wires leading to the turbo or something I could trace it back from?

Seems like whenever I find a manual for benz diesels the 350 is skipped.
Thanks for persisting, it does sound identical in symptoms,
Paul