40-3891330 Injector line, This is for the # 6 cylinder closet to the water pump end. This injector line is for the 4800/5000 series Hercules engine only.40 3891330 Injector line, D4800 5000 series Hercules diesel engine, This injector line is for the # 6 cylinder only (closet to the water pump) and will not work anywhere else. Please study the photograph picture and compare this line, to yours. We have provided a picture from the original parts book. This parts page is for a power unit, spec number X48 and the drawing is a little rough. Use it with caution. Other part number associated with this