On EFI applications the return fuel is under little to no pressure compared to the supply so it can tolerate a smaller line. I wouldn't push my luck though on a 1/4" line though.
EDIT - Also, with some EFI setups you can PWM control the pump so you may have very little return flow so that makes running a smaller line way more feasible. AG.
Last edited by turbobitt; 09/02/2108:54 PM.
1970 Challenger w/572 Hemi street car and my pride and joy.
1986 T-Type with 272 Stage 2 Buick V6 engine - True 8 second street car. Just updated the engine and put down 928 HP @ 35# boost to the ground on chasis dyno.
1976 Cee Bee Avenger Jet Boat - 460 Ford powered.
