I've noticed that the in-line fuel filter on my 240D will have 4-5mm of fuel at the bottom or fuel injector side of the filter while the car is running and the fuel looks like it dribbles into the fuel filter. Acknowledging that the flow to the filter is a gravity feed I still don't think this is the flow of fuel that I'd expect. I've removed the filler cap and there was no change. My question is, is this normal or do I need to clean out or replace the tank filter?

Oh, and the in-line filter does fill once the car is tuned off.

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Fred Johnson
1977 240D
1983 300SD