Re: what size fuel fittings
I would run a -8 AN line from the tank to the pump, a -8 AN line from the pump to a regulator, and two -6 AN lines from the regulator to the carb. If your pump and regulator were common, then you would need:
Fittings:
Four 3/8-NPT to -8 AN fittings (one at the tank, two on the pump, and one on the regulator)
Two 3/8-NPT to -6 AN fittings (both on the regulator)
Two 7/8-20 -6AN carb fittings (these screw into the bowls)
Line end fittings (for the ends of the hoses):
Four -8 AN fittings
Four -6 AN fittings
Some pumps and regulators require 1/2-NPT fittings rather than 3/8-NPT, so you would need to check first.
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