The fuel tank vent valve is part of the car's evaporative emission control (EVAP) system that prevents certain vapors from being let out into the environment.
Fuel tank vent valve operationThe fuel tank vent valve has a role in the vehicle's Evaporative emission control system which is designed to stop gasoline vapors from being released into the atmosphere. The fuel tank vent valve operates by leading excessive vapor to the charcoal canister when the fuel tank has too much pressure to deal with. This process is prohibited when the PCM detects a leak in the EVAP system.
Common problems with a faulty fuel tank vent valveA worn fuel tank vent valve can lead to stalling, pressure overload, or an increase in emissions.