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Mechanical Part of
Engine
Section V Emission Control System of Engine
I.
Fuel Evaporation Control System
1.
Description
Schematic diagram of fuel evaporation system
The fuel evaporation system is used to reduce hydrocarbon compositions emitted into ambient air from
fuel system. Reduction of hydrocarbon is achieved by using active carbon in EVAP carbon canister.
When the engine is stopped or fuel is filled, the fuel evaporation from sealed fuel tank will be introduced
into EVAP carbon canister with active carbon and stored there. During operation of engine, the fuel
evaporation in EVAP carbon canister will be introduced into intake manifold through clean passage.
EVAP carbon canister is controlled by ECM. With engine running, evaporation flow controlled by EVAP
canister solenoid is adjusted with direct proportion of increased air flow. During deceleration and idling,
the evaporation passage may be cut off by EVAP carbon canister solenoid.
Air cleaner
Intake manifold
EVAP carbon canister
solenoid valve
Fuel tank
EVAP carbon
canister
Fuel evaporation
Air
