Sorry for the long initial post. Just trying to include all of the details to aid in diagnosis.

I continue to search, but I am not coming up with much where the fuel and filters can be ruled out as the culprit and the car dies after being warmed up and running well.

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Pictures of the MB: http://s230.photobucket.com/albums/ee41/EricandRobyn/1981%20Mercedes/

1981 300 SD with a Goldenrod water block and Injetor line heaters. EGR is missing

1999 F-350 with HP X-over, Dahl 100 Fuel Filter, Coolant by-pass filter, CCV mod, Tymar intake.

Both on single tank WVO blend