on my 74, the tank vents with a small hose to the back of the engine. there is a steel tube along the top of the intake manofold, then a small plastic tube to the fitting where the hose to the vapor seperator connects. I guess it is supposed to suck air from the filter boxthru the vapor seperator system. when the vapor seperator system plugged up, my tank would "whoosh" when I removed the gas cap. I think the hose is green.
cliff
cliff