Iiiiiiinteresting.....
I have this exact same problem. 1990 740 GL with a .... formerly Regina fuel system. It has a new bosch style pump installed, and that has a check valve in it.
I haven't opened up the trunk to check the tank pump because of the fumes involved. I suspect my late friend and owner of this car may have caused some issues in the tank too.
What is this fuel accumulator? Sounds like one of the anti-surge type things that damp the fuel lines and prevent resonance. The search function isn't working right now, so I'm not seeing anything on a search.
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