Bench test Vacuum on fuel pump

[AnthonyG]

Using a engine vac gauge as pictured. Bowl Gasket looked fine & still flexible, also put thin layer of grease on both sides, installed bowl to pump tightening hand crank as tight as advisable. Using finger to actuate pump arm. Seeing no Vac reading? Can I assume pump is shot? I used it for a couple years, it sat dormant for a year while refreshing engine, could that destroy the internal diaphragm?