I hesitate to show what I drew up 20 years ago or more. Manifold vacuum is essentially a fore pump for the vacuum part of the fuel pump.

It didn't take long for me to convert to electric and I've been happy ever since.
Attachments
Vac Fuel Pump Setup 700.jpg (14.97 KB, 164 downloads)


1948 3/4-Ton 5-Window Flatbed Chevrolet

34 Years. Now with a '61 261, 848 head, Rochester Monojet carb, SM420 4-speed, 4.10 rear, dual reservoir MC, Bendix up front, 235/85R16 tires, 12-volt w/alternator, electric wipers and a modern radio in the glove box.