The tank vent valve serves a managed regeneration of carbon canister (AKF) using scavenging air. The scavenging air drawn through the carbon canister is enriched with hydrocarbons (HC) according to the level of charge of the activated carbon (HC) and then fed into the engine for combustion.
The development of hydrocarbons from the fuel tank is highly dependent on:
- the fuel and ambient temperatures
- air pressure
- the fuel level within the tank
The tank vent valve is closed when in a flow-free state. This prevents fuel vapours from the carbon canister reaching the intake manifold when the engine is not running.