Fuel Tank Cap 16117222330 For BMW F15 F25 F35  F49 F18 G12 E83

A fuel tank cap, also known as a gas cap or fuel filler cap, is an essential component of a vehicle's fuel system. It is designed to securely seal the fuel tank, preventing fuel leakage and evaporation. Fuel tank caps are typically made of durable materials such as plastic or metal and are equipped with a sealing gasket to ensure a tight fit. They play a crucial role in maintaining the integrity of the fuel system and preventing contaminants from entering the tank.

The primary function of a fuel tank cap is to prevent fuel from spilling or evaporating from the tank. It acts as a barrier, sealing the fuel tank and creating a closed system. This not only helps to prevent fuel wastage but also reduces harmful emissions and protects the environment. Fuel tank caps are often equipped with a pressure relief valve to allow for the release of excess pressure or vacuum that may build up inside the tank due to temperature changes or fuel consumption.