I have a '73 Dart with a 318 and mechanical fuel pump and considering using the fuel vent line that comes from the sending unit up to the engine bay as a fuel return line. I would use a filter like NAPA 3054 with a second outlet and hook it directly up to the vent line after cutting off the ball check valve. I would use a vented cap or add a vent to the top of the filler tube like earlier models. I understand the importance of keeping the cannister and having the fuel return enter the tank below the gas level, but would just like to know if anyone has done this before with any success. I am trying to do everything I can to prevent percolation and vapor lock. I will also have a 1/2" phenolic carb spacer, carb heat shield, and insulate all fuel lines. Thank you!
