Fuel Evaporation System: Operation
With engine off, gasoline vapors are collected in the liquid/vapor separator. Liquid fuel condenses and flows back to fuel tank. Vapors are routed to carbon canister where they are stored until engine is started. With engine running, vacuum opens the purge valve, allowing vapors to flow to intake manifold where they are burned. Liquid/vapor separator compensates for fuel expansion of a filled fuel tank when temperature reaches about 80°F (27°C).