911 Carrera 2 Targa F6-3600cc 3.6L SOHC (1992)
Evaporative Emissions System: Description and Operation
Tank Venting Valve
Tank venting valve is a solenoid valve applied in line to correctly meter additional fuel vapor drawn from carbon canister after vaporization. It is
operated by DME control unit and receives a signal which is dependent on intake air flow rate and similar to fuel injector signal. When intake air flow
rate is low, valve receives a short time signal. When flow rate is high, valve receives a longer time signal. This allows correct flushing air volume to be
mixed in correct ratio to intake air volume.