Lots of good advice from everyone here. The tank of a '48 is under the bed and doesn't produce the head of pressure that a behind the seat tank would. A quick filter change would release some gas but might do some good on the driveway grease.

Pumps indeed don't pull as well as they can push. When they pull, there's a maximum of 14 psi (atmospheric pressure) doing the job for you. They can push at whatever they were designed for.

So, I'm going with a metal in-line filter before the expensive dual stage fuel pump (and watch the performance) and the little one that screws onto the carb.

Thanks everyone!!

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.