WALBRO Pump for Carbureted System??

i dont think the brand or psi of the pump matters as much as the setup.

clean or new tank, supply and return lines with bypass regulator before the carb
pre pump filter (coarse 100 micron) post pump filter ( finer around 40 micron)

you choose pumps not by psi but by gallons per hour... horsepower * .5 divided by 6.2

so 400hp you need 33 gph
500hp you need 40 gph 6an supply and return lines 3/8"
600hp you need 50 gph 8an supply and return lines 1/2"
etc


you could call aeromotive or walboro or one of the others and one of their techs will help you get the right model pump & regulator for your needs.

http://aeromotiveinc.com/tech-help/frequently-asked-questions/faq-carbureted-regulators/