9-5 Sport Wagon (9600) V6-3.0L Turbo (B308) (2003)
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Evaporative Shut Valve: Description and Operation
System Functions When Refuelling
1. At the top of the fuel filler pipe there is an ejector. It has no moving parts but it has flexible slots.
When the pump nozzle is inserted in the filler pipe, the ejector opens its slots. The pump nozzle is supported by four ridges in the pipe inside the
ejector. When fuel is flowing, the surrounding air will be drawn through the ejector slots by the effect of the ejector. The air mixes with the fuel
behind the ejector and the mixture passes through the pipe and down to the tank.
This prevents hydrocarbons from being emitted from the filler pipe during refuelling.
2. There is a check valve in the neck of the filler pipe. The check valve is normally closed by a weak spring and allows flow only in the direction
towards the tank.
The valve opens when fuel is being filled and closes immediately as the fuel starts flowing in the opposite direction when the tank is full.
In this way, the valve prevents "back-spit".
