i would start at the fuel accumulator. you can check it by removing the small vent line on the end of it and see if fuel come out of the vent hose while cranking car. if so the rubber diaphragm in the accumulator is bad. or you could check fuel pressure with engine off.

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1985 300TD Turbo Euro-wagon
1979 280CE 225,200 miles
1985 300D Turbo 264,000 miles
1976 240D 190,000 miles
1979 300TD 220,000

GONE but not forgotten
1976 300D 195,300 miles
1983 300D Turbo 175,000 miles

http://i42.photobucket.com/albums/e3...e485-1-2-1.jpg