XCMG Spare: Fuel Return Pipe 860152365 | Diesel Fuel System Return Line

A fuel return pipe (also called return pipe, fuel return hose, or injector return pipe) is the return-line component in the diesel engine fuel supply system, responsible for routing excess fuel from the injectors, injection pump, or fuel rail back to the tank after pressure regulation. In automotive fuel systems, the supply pipe delivers fuel from the tank through the filter to the engine's fuel rail for temporary storage, then to the injectors for mixing with air upon energization; the return pipe sends excess fuel back to the tank—the two serving distinct roles, with the supply pipe generally having a larger diameter than the return pipe. On diesel engines, the return pipe similarly handles the "excess fuel return" task, forming a key line for maintaining stable fuel system pressure.