I had a Volvo inline six from the early 1970's with a VERY rudimentary electronic port fuel injection system. I believe it was a Bosch K-Jetronic. It used an electric motor driven remote fuel pump mounted on the frame just ahead of the fuel tank that produced 50-something PSI of fuel pressure. With an adjustable pressure regulator and a return lie to the tank, it would probably solve the problem of how to pump gas on a stovebolt installation.
For instance:
www.ebay.com/itm/363747105311?Jerry