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This use of the pump as a pressure source is mentioned in some of the earlier manuals... I think the two circa 1952 Speed books, Roger Huntington's and California Bill's flathead speed manuals, mention this, and there is also a bit in the circa 1959 Spotlite booklets on fuel systems on this practice. It would make a lot of sense in a circle track car. I have heard plenty of yarns about people losing races because they got carried away driving and forgot to keep after the hand pump!
I like those British pumps with the hand levers...wish I had one!