return line for EFI conversion

Bear in mind that if a 1/4" fitting is the "best you can do" it will not be nearly as restrictive if you run 5/16 tube for the rest of the return, as it would be if you used all 1/4" tube. That, essentially, is what I have now..................

a homemade 1/4" fitting which was originally intended for vapor lock/ fuel return with a carb system, as I never foresaw an EFI on the car. If I recall, with the Holley TBI, I have about 2.5 LBS return line back pressure with 18 PSI operating pressure at the regulator.