The fuel oil arrangement, code P51430-28, comprises the integrated system of pipes, filters, valves, and sensors responsible for the preparation, distribution, and management of fuel oil within the MAN L21/31 engine. This carefully configured network ensures proper fuel conditioning—such as temperature control, filtration, and pressure regulation—before injection. By optimizing fuel quality and flow dynamics, the fuel oil arrangement enhances combustion stability, engine responsiveness, and operational safety, especially in variable-load marine environments and power generation facilities.