Join Date: Aug 2007
Location: Los Angeles/SFV
Re: Do ALL 71 Chevelles have a fuel return line?
Rather than vapor lock issues, I think the vapor lines are primarily to reduce emissions into the atmosphere from evaporation, which is why the gas tank has a nonvented, i.e., sealed cap. The system works by sucking fumes out of the gas tank, through the vapor canister, into the intake, according to specified parameters (mostly on startup I think). I've read somewhere that a parked '65 Mustang emits more pollution just sitting there than a new Honda does while running.
'70 El Camino