Fuel Tank Vent Valve

An automotive fuel tank vent valve is a component found in vehicles that use a closed fuel system. The fuel tank vent valve is responsible for regulating the pressure inside the fuel tank and preventing fuel vapors from escaping into the atmosphere. The valve is typically located on or near the fuel tank and is connected to the fuel tank vent line. The fuel tank vent valve functions by allowing air to enter the fuel tank when the pressure inside the tank drops below a certain level. This occurs when fuel is consumed by the engine or when the vehicle is sitting idle. As air enters the tank, it replaces the volume of fuel that has been used, preventing a vacuum from forming. When the pressure inside the fuel tank rises above a certain level, the fuel tank vent valve closes, preventing fuel vapors from escaping into the atmosphere. This helps to reduce emissions and ensure that the vehicle complies with environmental regulations. Without a functioning fuel tank vent valve, the pressure inside the fuel tank can become imbalanced, potentially leading to fuel tank vent valve symptoms including poor engine performance, fuel leaks, and increased emissions.