Genuine OEM Audi Fuel Return Line, part number 4G0201533D. This critical component is responsible for safely returning excess fuel from the engine back to the fuel tank, ensuring proper fuel system pressure and preventing over-pressurization. It is typically routed along the vehicle's underbody, connecting the engine's fuel rail or pressure regulator to the fuel tank. Weighing approximately 0.377 kg, this line is engineered for precise fitment and long-term durability. Choosing a genuine OEM part ensures correct material composition and resistance to fuel degradation, preventing leaks and maintaining system integrity.