2 vent v 1 vent
I have a 1968 GTO with AC. I haven't had the car long and just started working on it. When I raised the care I noticed there were two lines adjacent to the fuel pump. One (smaller in diameter) was left unattached to the fuel pump and the larger one was attached to the fuel pump. The fuel pump only had 2 fittings, one from the tank, the other to the carb. I checked the tank and sure enough there was a feed line and return line. I did some checking and it seems AC cars had return lines. Can anyone tell me why the AC cars have the return line and also would it hurt if I didn't run a return line (seems you can find new tanks with the filler neck for single lines and not so much for double lines)?