The line out of the tank was 3/8" also. :tuWhat size fuel line came out of the gas tank for dual fours factory installed cars? I know the fuel line was on the outside of the frame and it was a 3/8" line. But most of the cars had a 5/16" fuel line coming out of the gas tank.
3/8 gas tank sending units on page 124 of Ecklers catalog. Fuel line (OUTSIDE FRAME ) ON PAGE 125The line out of the tank was 3/8" also. :tu
-Bruce