Fuel System: Avanti fuel line outside diameter

[SILENTBOB]

What is the outside diameter of the metal fuel line that runs from the fuel tank forward - 5/16th or 3/8th?

Thanks for the help

[bezhawk]

On Studebaker models, they have two (2) lines. Main supply line is 3/8", and Return line is 1/4".
Later Chevy engined ones had just 1 line, and was on the passenger side, and I've seen both 3/8", and 5/16".

[SILENTBOB]

Thanks for the quick response.

[dynolou2]

My 1985 Touring Coupe' with HO-305 has two lines a 3/8 for fuel to pump, and a 1/4 for the return. Lou Cote