Genuine OEM Audi Fuel Return Hose, part number 4F0201216AA. This critical component is responsible for safely returning excess fuel from the engine's fuel rail or pressure regulator back to the fuel tank, helping to maintain correct fuel pressure within the system. It is positioned as part of the fuel delivery and return network, often running along the vehicle's underbody. Constructed from fuel-resistant rubber or synthetic materials, this hose is designed for durability and leak-free operation. Using a genuine OEM fuel return hose ensures proper material compatibility with fuel, correct routing, and secure connections, which are vital for preventing leaks and maintaining fuel system efficiency.