Genuine OEM Volkswagen Fuel Return Line, part number 03C133713J. This critical component is responsible for safely returning excess fuel from the engine's fuel rail back to the fuel tank, maintaining proper fuel pressure and circulation. Its specific material composition is designed to resist fuel degradation and withstand engine bay temperatures. Weighing 0.022 kg, this line ensures a precise fit and leak-free operation. Using a genuine OEM fuel return line is essential for preventing fuel leaks, maintaining correct fuel system pressure, and ensuring the safe and efficient operation of the engine.