I am using the new beige braided fuel hose that the MB dealer sells. I'm quite particular about using genuine parts. I just relaced the hose this morning for the third time. I have driven about 50 miles today and the leak seems to have dried up, but last time it took 130 miles so I guess I will wait and see.
1976 300D (W115) - 330K and still going (sort of)
1991 300D 2.5 Turbo - Sold at 221K
1983 280SEL - Sold at 206K
1981 300SD - Sold at 232K