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What is the carbon canister?
Cars have three main sources of air pollution, along with the federally mandated systems installed to reduce these emissions. First, the crankcase emissions are returned to the engine by the positive crankcase ventilation (PCV) system. Second, the tailpipe exhaust emissions are controlled mainly by the exhaust gas return (EGR) system, the catalytic converters, and by electronic control unit adjustments (ECU) to the engine. Finally, fumes from the gas tank are sealed from the atmosphere by the gas cap at the fuel filler, and stored in a carbon canister (CC) for reburning when the engine is running. The CC, gas cap, lines and controls are sometimes collectively referred to as the EVAP (evaporative) system. A car’s EVAP system is passive. The gas fumes are trapped in the carbon canister while the car is at rest, then purged back into the intake system using vacuum pressure when the car is running.
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