73 Mopar 340 not pumping fuel

when things like this happen I ask myself , What is different from before (when it worked) and after (when it does not)?
answer that and you might find the issue. Also just a note, don't use teflon on anything other than pipe threads and then use sparingly. To much and it can squeeze out and block the flow. Stock pumps are only producing about 3psi.
missing linc made a good point about the key way.