9-5 Aero (9600) L4-2.3L Turbo (2.3HOT) (2004)
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Evaporative Emission Control Canister: Description and Operation
Evaporative Emission Canister
The evaporative emission canister is located on top of the tank and comprises a canister filled with special carbon pellets. Carbon pellets are used to
obtain as little back pressure as possible from the emission canister. Evaporated hydrocarbons from the tank pass through a line to the emission canister.
When refuelling, the hydrocarbons and air from the tank are evacuated via a line to the emission canister, which absorbs the hydrocarbons.
Separate lines connect the evaporative emission canister with the fuel tank, EVAP purge valve and shut-off valve. When the engine starts, air is drawn in
through the shut-off valve to the emission canister and then via the purge valve into the intake manifold. The hydrocarbons are taken with it and are
burned in the engine.
The evaporative emission canister absorbs approx. 80 g hydrocarbon for each full tank. The emission canister is purged while the car is being driven, the
time it takes depends on the driving. The emission canister can absorb a maximum of approx. 120 g hydrocarbon.
