9-3 SE Convertible (9400) L4-2.0L Turbo (B205) HO (2001)
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3. Fuel is filled into the tank. A small amount of air from the filler pipe ejector enters together with the fuel. Above the surface of the fuel in the tank
there are gaseous hydrocarbons.
As the fuel level rises, the air and gaseous hydrocarbons will be evacuated through the float valve fitted in the top of the tank. The fumes then pass
to the EVAP canister, where the hydrocarbons are absorbed. The air, which cannot be absorbed, passes from the EVAP canister to the atmosphere
via a vent pipe in the wheel housing next to the filler pipe.
A shut-off valve is fitted to the top of the vent pipe. The shut-off valve can close the EVAP canister connection to the atmosphere and is only used
for OBD II diagnosis. ORVR without tank integrity diagnosis does not have a shut-off valve as there is no requirement for diagnosis.
The float valve also acts as a rollover valve and closes in the event that the car rolls over.
