Hello,
I had a very similar problem with a 1934 Ford car I restored last year in that the replacement fuel pump would not suck a drop of fuel out of the tank. Clean tank and fuel lines. Drove me crazy until I found the culprit.
The reproduction pump had a cork gasket installed that allowed just enough vacuum to slip by to keep the pump from working properly. Replaced the cork gasket with a rubber one and problem solved!
May be not your problem, but might be something to look for.
Thanks, David
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