The component with the lowest price in the OIL PUMP-FUEL PUMP schematic is the Screw 5x12.
Some items from this specific schematic: Washer (6.5x24x1.6), Lock Washer, Bracket,fuel Pump, O Ring,oil Strainer Cap.
The Oil Pump-fuel Pump is made up of components including this Pump Assy,fuel which is the most expensive.