So the new fuel pump was installed... as well as the new (see-through) fuel filter. Engine cranked right up, so I'm happy with the outcome despite not REALLY knowing which item caused the problem.
But of course, now the outlet tube leaks at the pump connection, so that will require some attention. Both of my sources say NOT to use thread tape on those threads. It's remotely possible that the pipe may now have a split in it or some such... regardless, it leaked easily even after close attention was paid to the tightening of it. SIGH... it's always the last 5% of the project
And I DO believe I'm already seeing little brown specks on the new bright yellow filter material...
Thanks for the input here.