Genuine OEM Audi Fuel Supply Unit, part number 8K0919051R. This assembly is responsible for drawing fuel from the tank and delivering it under pressure to the engine's fuel system. It also incorporates a fuel level transmitter to monitor the amount of fuel in the tank. This unit is typically located within the fuel tank. The precise manufacturing and calibration of genuine OEM components ensure optimal fuel delivery and accurate fuel level readings, crucial for engine performance and drivability.