QSB4.5 Cummins Fuel Pump 5284018 Parts Catalog Ref No. Part Name Part No. Required 　 Hexagon Flange Nut 3900589 2 　 Double End Plain Stud 3902501 2 　 O-Ring Seal 5271958 1 　 Fuel Pump  5284018 1 　 Fuel Pump Gear 5285411 1 Above is the introduction of the 5284018 Cummins Fuel Pump, while if you need Fuel Pump 5284018, …