Anyone else? Odd, often overlooked places?

It’s possible my hose clamps are biting slightly into the line, but I’ve checked them pretty well. It’s also possible that my crush washers on the overflow valve are not sealing properly.
Seems unlikely I have any microcracks in the clear lines, so I suppose that’s also possible.

One thought that did occur, if any of my delivery valve crush washers within the injection pump are no longer seating properly, is it possible air would be getting into the IP from there? (I am not getting any fuel leaks from the IP)

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1981 240D 4sp manual. Ivory White.