very common M103 problem..
chances are (from cheap to expensive)
- fuel pump check valve (~$15 at partsshop)
- over voltage protection -ovp- relay (less likely in this matter)
- fuel accumulator (next to fuel pump, ~$120)
- fuel pressure regulator (under air cleaner next to fuel distributor, >$200)
many people just give up and crank more than once when the engine is warm. in my case, i replaced the check valve and fuel accumulator, no help. considering my ovp is in good shape (no hot start problems), only item left is the fpr which costs arm&leg at the MB dealer.
2001 E200 Kompressor Avantgarde
1987 300E 5-speed
1975 280S (sold)
1973 230.6 (sold)