Bill, NAPA3369 -> hand pump -> primary (clear) in-line filter -> secondary filter (cannister style). In microns thats 10 -> 50 -> 15 or 16. I drain a bit from both NAPA and secondary filters before a day's run, then watch the primary filter when I hand pump before starting the engine. Original hand pump (leather oiled annually), and the loop glow plugs haven't been changed in a very long time. I've also been accused of being a fuel fanatic, but I travel a few miles away from stores that carry parts for these cars.

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daBenz - 1970 220D