3899412 | Genuine Cummins® Fuel Return PipeDescription: Fuel Return Pipe Condition: New Brand: Cummins Part Number: 3899412 Type: Pipe Fitment Guide: Cummins Weight: 5 lbs Functions: Emission control: The return pipe helps to maintain the proper fuel to air ratio, which is essential for reducing emissions. Fuel system regulation: By recirculating fuel back to the tank, the return pipe helps to regulate the fuel supply to the engine, ensuring that the engine receives the appropriate amount of