Cranking speed is not a good way to check a fuel pump. At curb idle with a warmed-up engine, a disconnected fuel line at the carburetor should pump a minimum of a pint in 30 seconds -. Use a piece of rubber fuel line and a catch can held away from the engine compartment to minimize the fire hazard. If the engine won't idle for 30 seconds on the fuel in the float bowl, you've got carburetor problems.
The volume test is one third of a fuel pump check. Now check the pressure and vacuum of the pump. Since I've been recommending this for 20-something years and I can't ever recall anybody doing the full test, I might as well go look for a chicken with lips!
Jerry
