Genuine OEM Audi High Pressure Fuel Pump Return Hose, part number 03H133322E. This critical component is responsible for safely returning excess fuel from the high-pressure fuel pump back to the fuel tank or low-pressure side of the system. It ensures the fuel system maintains optimal pressure and prevents over-pressurization. Using a genuine OEM hose guarantees correct routing geometry, resistance to fuel and engine bay temperatures, and long-term leak-free performance.