Industrial 861676A-1 Fuel Pump

861676A1 PUMP ASSY-FUEL is a Mercury Marine/MerCruiser OEM mechanical fuel pump designed for four-cylinder inline MerCruiser engines. This low-pressure Carter-style pump is commonly used on inline-4 GM-based MerCruiser powerplants in stern-drive and inboard installations, delivering fuel from the tank to the carburetor or fuel system as the engine demands. The part is widely cross-referenced as 42725A3 and is available through distributors as Sierra 18-7282, reflecting its status as the standard replacement for many MerCruiser inline-4 applications. The unit is a cam-driven mechanical pump (not electric) sold as a complete pump assembly and is associated with MerCruiser 3.0L MPI EC fuel systems and related inline-4 configurations. When replacing, verify the engine model/serial to confirm fitment of the 861676A1/42725A3 cross-reference for your specific MerCruiser installation.