You may or may not have read my thread about the similar problem I experienced last year with 2 brand new mechanical fuel pumps.

One failed after just a few hundred miles with symptoms that you describe leading up to total failure. I too, posted a question about possible vapor lock. The second brand new mechanical pump wouldn't pump a drop of gasoline straight out of the box! I thought for sure the cam lobe that drives the pump was wiped. After all, what are the odds that two brand new parts don't work?

Well, these days, new doesn't mean Jack Shiite. I sent my original glass bowl fuel pump to Then and Now Automotive for a rebuild and the problem has not returned. If you have your original pump, rebuild it. If you don't have one, buy one on ebay or whatever and have it rebuilt.

https://www.stovebolt.com/ubbthread...63250/fuel-pumps-and-other-nonsense.html

More on the fuel pump problem I experienced.

https://www.stovebolt.com/ubbthreads/ubbthreads.php/topics/1458111/1.html

1950 Chevrolet 3100 (Ol' Roy)

1939 Packard Standard Eight Coupe (The Phantom) | 1956 Cadillac Coupe de Ville (The Bismarck) | 1964 Ford Galaxie 500 coupe |1966 Ford Mustang (Little Red) | 1969 Pontiac GTO (The Dishpit) I 1979 Ford F-100 | 1976 Ford F-150 (Big Red) | 1995 Ford F-150 (Newt)