Can a leaking fuel pump gasket cause vacuum leak?

1920's don't hold a lot fuel, so in my opinion it could be the fuel pump (even though it shows 5 pounds) what is the volume it puts out at 5 lbs?
Not expecting you to know the answer to that right now, but I am expecting you to find out. :D
Like you said, everything else you could think of has been done.

Pumps are cheap, but I also realize we cant always just run out and buy something either.