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Also, failed to mention. Make sure the mechanical fuel pump you purchase, has true 3/8 inlet & outlet ports.
For my 470", I found an obscure, NOS 1968-1969 Chevrolet Corvette fuel filter with the vapor return line. Filter Part # GF-432 / GM part # 5651480.
Went through a lot of trouble as this is one of the only fuel filters with 3/8" inlets & outlets with a return line (being able to attach AN fittings). 1/4" vapor return line, with the correct internal fuel restriction size. Wasn't looking to bleed off fuel pressure, just remove vapor in the fuel system, which will cause vapor locking issues.
This is an easier choice with 3/8 inlets & outlets;
Which would be great, except they're near impossible to find. I believe WIX stopped producing them. Shame, but they still produce the 5/16 version.
Just the fuel being routed through the FUEL PUMP slowly caused vapor lock, the ethanol blends have that much lower of a boiling point. Same thing with my 318 LA engine, mechanical fuel pump was superheating the fuel.
Yes, go with 3/8 and 5/16 return. I had to replace the fuel tank on my charger and ran 3/8 the whole way. Sweet5ltr is correct…. Make sure the fuel filter is 3/8 in and out. Also make sure the sending unit is 3/8 and any other line in and out of the mechanical fuel pump and carburetor. It would be a waste of time if it goes down to 5/16 Anywhere from tank to carb.