Not getting fuel... big issuse!

A mech pump will suck air before fuel. Check for leaks first, then retry it. sucking a mouthful of gas- more vacuum than the pump(been there).
Correct any leaks, check everything; try again. No gas, lube old pump and try it. If good, replace. If not, put a piece of wire against eccentric, and see if it moves enough.
I can't believe that I had an eccentric come loose, and didn't jump the chain.
Lucky that time.
Just something to consider; I feel for your problems, but after owning sb 's since 1970, have seen weirder things happen.