Fuel Tank Vent: Description and Operation

Fuel Supply, Low-pressure Side

Fuel tank ventilation

Tank ventilation










The fuel tank is aerated and vented exclusively via the active carbon filter, which acts as an intermediate storage device for any HC emissions. Regeneration of the active carbon filter takes place via the tank vent valve when the engine is running.

The active carbon filter is installed behind the wheel housing liner at the rear right. The tank vent valve is located in the engine compartment (on the right next to the electronic throttle in V8 engines).

When the engine is running, the fuel tank is vented by the tank vent valve, which is controlled by the DME control unit, to the intake system of the engine.
- On the turbo engine, a check valve closes the connection to the intake manifold when boost pressure is present.