EFI tank with Carbureted engine plumbing questions

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I would suggest you plumb it this way. Reason being is that this actually controls the fuel pressure at the carb and it will not change depending on the condition of the fuel filter. Just imagine the hot rod pump being in the tank.

Fuel filters are pressure drops by themselves, and as they get more dirt in them, the pressure drop increases.

I did an EFI system and both the feed and return line are 3/8", I ran the return line down my subframe connector and then it went to a braided teflon line at each side at the engine and at the tank. It was just easier to do it with the -6AN fittings.