Good work Toddit, think you are on the right path. The Fuel Pump is definitely in the right neighborhood. The question that comes up from it would be, do the A-20, B-25 and C-47 all use the same fuel pump?
I have the following engines for the following aircraft:
A20- R2600
B25- R2600 (SU recieved 800 aircraft)
C-47 R1830
I would guess the different engines use different pumps. Going on this assumption, it would exclude the C-47 leaving only the A20 and B25 as candidates.
However, there is one odd point in this. The Brewster Buffalo used a Wright Engine. Is it possible it is one of those aircraft from either Finland or some other odd association? One way to tell for sure if to note how many engines were found at the wreck site.