Tank vent valve

The tank vent valve regenerates the activated carbon canister by means of scavenging air. The scavenging air which is drawn through the activated carbon canister is then enriched with hydrocarbons and fed to the combustion engine.

The tank vent valve is closed when in a de-energized state. This prevents the ingress of fuel vapor from the activated carbon canister into the intake pipe when the engine is at a standstill.

The tank-ventilation valve is supplied with 12 Volts of vehicle voltage via the DME. The DME activates the tank ventilation valve on the earth side.

Fig 1: Identifying Tank Vent Valve And Plug Connection

Courtesy of BMW OF NORTH AMERICA, INC.

The tank vent valve is closed when in a de-energized state. This prevents the ingress of fuel vapor from the activated carbon canister into the intake pipe when the engine is at a standstill.