Fuel Evaporation System: Description

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All Light and some Heavy Duty Emissions models are equipped with an Evaporative Control System (ECS), designed to prevent raw fuel vapors from escaping to the atmosphere. System consists of a special fuel tank with an expansion section, a venting system which allows only vaporous fuel to be drawn into the system, a pressure-vacuum relief valve in the gas cap to control tank pressure, and a vapor-storing charcoal canister.