Fitech 400 EFI return line ?

[dodge71demon]

I will be installing the Fitech EFI using an EFI ready fuel tank can I use the existing 5/16 steel fuel line as the return or do I need to upgrade to 3/8 --- Thanks

 

[clv22p]

You should do 3/8ths. Most suggestions on fuel systems say to use the same size return line to ensure there is no backpressure on the regulator.