Fuel Pump Low Pressure Gen III Cool Fuel | Sierra 18-8865 Low Pressure Gen III Cool Fuel Pump | Sierra 18-8865 Low pressure electric fuel pump kit for Mercruiser Gen III Cool Fuel systems includes pump, isolator & seals. For Mercruiser GM V8 marine engines with Gen III Cool Fuel module Pump is installed down inside the fuel module Low pressure It is recommended that you replace the fuel filter element, PN 18-7977, inside the fuel module when replacing pump Replaces Mercruiser 866170A01