Fuel line size

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Nite Moves

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First i have searched some here with no luck..I have a 67 Dart with a small block. Im sure fuel line size from tank to pump is 3/8........Is this correct. Im getting 3/8 as a answer but also 5/16. I just want the correct size. Thanks
 
/6 cars had the smallest lines, v8 cars hve 3/8

i run 1/2 some people say its to much, comparing it , to FI cars that runn 600hp on 3/8, but not taking into consideration the PSI from FI pumps

ill be around 600ish HP with the new stroker build for my 71, 1/2 lin, at 7psi with an internally regulated pump, and another regulator before the carb, no return line.;
 
Never saw a 3/8 on a factory mopar. Think about this; Unless you are running huge, high rpm; how big are your needles and seats? what can they flow? Theory is, 5/16" fine (think hemis came with it). Bigger line, g forces push the fuel backwards, less surface friction on the fuel/interior tube wall.
 
Sorry guys, Max Wedges, Hemis and 440 Six Packs came with 3/8 line.
 
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