I don't know where in the line your fuel filter is located, but perhaps it is clogged?? Or maybe there is a "fuel distributor relay" which has gone kaput. If you car is like my 92 300TE 4matic, there seems to be a relay for practiclly everything, which is often at the culprit behind many a problem. Good luck.

1963 MB 220SEb Sedan
1992 MB 300TE 4Matic Wagon
1995 Subaru Wagon AWD