Genuine OEM Audi Fuel Line with Breather Pipe, part number 4N4201544AJ. This integrated assembly is responsible for safely delivering fuel from the tank to the engine and for managing fuel vapor ventilation, preventing pressure buildup and ensuring proper emissions control. It is positioned as part of the vehicle's fuel delivery system, typically running along the underbody from the fuel tank. This robust assembly measures approximately 2.7 meters in length and weighs 1.515 kg. Using genuine OEM fuel lines ensures precise routing, correct material compatibility with fuel, and leak-free connections, which are essential for safety, fuel efficiency, and environmental compliance.