Feed line is 3/8" and return is 5/16" to and from tanks selector to the valley of the engine. The return lines off the heads to FPR are 5/16" IIRC and the feed line assembly from the fuel pump to heads are approx. 1/4-5/16" IIRC.
I have another question about the electric fuel pump. Does it matter if it is mounted horizontally or vertically? I would like to do it vertically but I see everyone doing it horizontally.
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