Fuel Evaporation System: Operation: Notes

When engine is not running, fuel vapors from fuel tank, float bowl (12A carbureted engine), and engine are routed through vent lines to charcoal canister where they are adsorbed. When engine is running above idle, purge valve opens and fuel vapors are drawn from canister and engine into intake manifold for burning. The purge valve operates as the PCV valve and controls crankcase ventilation and fuel evaporation.