Changed out the hand pump last night. It appears that the leak is gone. It was so late when I finished that I followed PEH's advise and left the fuel filters alone. It was a little tricky getting a wrench on the little pump due to its angle and proximity to the fender well. The handles on all my wrenches were just too long.

Thanks to everyone for their input. It sure gives me confidence to do these repairs.

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1983 300D Silver -mine- 185,000 w/ donor transmission
1983 300D Gray (Franklin) -parts car- 180,000- no transmission and no oil pan
1994 S320 Silver -wife's-135,000