OK, '60 235 in my 3100 build. Under bed tank. Going to use a low pressure electric pump (wired to the ignition I think would be correct?).

If I lose the pump on the engine what do I do to block off the pump chamber so I don't lose vacuum?

If I lose the pump on the engine, do I run the fuel line straight to the carb?

Lastly, I had a line going from a vacuum can on the distributor to the carb, too. What is this?