Pos. | spare part no | Name |
1 | - | Evaporative Emission System Adsorber - Derivative for Rest of the World (ROW) |
2 | - | Ventilation piping and filter |
3 | - | Vapor pipeline to the adsorber of the fuel vapor control system |
4 | - | Evaporation line to intake manifold |
5 | - | Evaporative control system adsorber - North American variant (NAS) |
6 | - | Fuel Tank Leak Monitoring Pump |
7 | - | Fuel Tank Leak Monitoring Pump Filter |
8 | - | Fuel supply line to the engine |
9 | - | Evaporative emission canister purge valve |
Evaporative Emission System (EVAP) reduces the amount of hydrocarbons released into the atmosphere from the fuel tank. The system includes a carbon adsorber, purge valve, ventilation piping and hoses.
Fuel vapors form in the fuel tank. The higher the temperature of the fuel, the more vapors are produced. Through the ventilation system of the fuel tank, fuel vapors freely enter the carbon adsorber. The ventilation system includes safety dampers that prevent fuel from spilling out when the car is turned over, and a fuel liquid phase separator (separator), installed inside the fuel tank and connected to the external environment through a ventilation hose. The vent line allows fuel vapors to flow into the canister.
On vehicles for North America (NAS) fuel vapors displaced from the tank during refueling freely enter the carbon adsorber.
On all other vehicles, except for the NAS standard, fuel vapors displaced from the tank during refueling cannot enter the carbon adsorber, but freely escape into the atmosphere through the filler neck.
Fuel vapors entering the adsorber are absorbed by activated carbon and remain in it. Since the capacity of the carbon adsorber is limited, it must be purged. Purging is carried out with the engine running, in which fuel vapors are burned.
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