well, it seems that the sitting for a number of years has allowed the fuel tank, and some of the lines to rust from the inside. As I fix one thing, the weakest link exposes another leak somewhere else. The latest culprit is a leaking fuel tank. Used replacement on the way.
BTW, looking at a 91 300D2.5 today. Looks like I can get it for about $1500. We'll see. Its not a replacement, just another one. I'm sure my wife will be REALLY happy to have another MB Diesel in the driveway