Fuel Evaporation System: Description

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The Evaporative Emission Control System (EECS), prevents raw fuel vapors from entering the atmosphere. It consists of a venting system which allows only vaporous fuel to be drawn into the system.

During engine operation, vapors are drawn through system vent lines and into intake manifold. When engine is off, fuel vapors are stored in vapor storage canister charcoal. Vapors are drawn into intake manifold when engine is running again. See Fig 1 .

Fig 1: Open-Bottom Canister (2-Tube Type)

Courtesy of GENERAL MOTORS CORP.