Sierra Fuel Pump 18-8860 for MerCruiser 8.2L MIE and MPI MIE 502 V-8 Engines

The Sierra 18-8860 is a mechanical fuel pump built for MerCruiser 8.2L 502 cid V-8 stern drive and inboard engines. It draws fuel from the tank and delivers it to the carburetor or fuel injection system at the pressure and volume the engine's fuel delivery design requires, replacing a worn or failed factory pump with a unit built to original equipment specification.

The pump body is aluminum for corrosion resistance in a marine engine compartment, and it uses a tank-mount configuration with mechanical (non-electric) operation. Both the inlet and outlet connections are 1.13 inch hose barb fittings, matching the fuel line routing on applicable MerCruiser 502 cid V-8 engines. It is designed as a direct fit for the specific engine/serial number ranges listed below, so confirming your engine model and serial number before ordering ensures correct fitment.

This is a straightforward mechanical replacement part with no electronic components to program or calibrate, making it a common service item for engine maintenance and fuel system troubleshooting on covered MerCruiser 8.2L applications.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-8860
• Product Type: Marine Fuel Pump
• Operation Mode: Mechanical
• Mounting Type: Tank Mount
• Body Material: Aluminum
• Inlet Connection Type: Hose Barb
• Inlet Connection Size: 1.13 inches
• Outlet Connection Type: Barb
• Outlet Connection Size: 1.13 inches
• Item Dimensions: 4.6 x 6.9 x 5.2 inches
• Weight: 1.82 pounds
• UPC: 808282294724

Fitment

• MerCruiser 8.2L MIE 502 cid V-8, 1993-1996, engine serial number D857200 through F819619
• MerCruiser 8.2L MPI MIE 502 cid V-8, 1996-1997, engine serial number F819620 through K147349

Frequently Asked Questions

What engines does the Sierra 18-8860 fuel pump fit? The Sierra 18-8860 fits MerCruiser 8.2L MIE 502 cid V-8 engines built in the 1993-1996 range with engine serial numbers D857200 through F819619, and MerCruiser 8.2L MPI MIE 502 cid V-8 engines built in the 1996-1997 range with engine serial numbers F819620 through K147349.

Is this fuel pump mechanical or electric? The 18-8860 is a mechanical fuel pump, meaning it is driven off the engine rather than powered electrically.

How do I confirm the 18-8860 is correct for my boat? Check your MerCruiser engine's serial number against the covered ranges: D857200-F819619 for the 8.2L MIE 502 V-8, or F819620-K147349 for the 8.2L MPI MIE 502 V-8. Matching serial numbers confirm the 18-8860 is the correct fuel pump.

What size are the fuel line connections on the 18-8860? Both the inlet and outlet connections on the Sierra 18-8860 are 1.13 inch hose barb fittings.

What material is the Sierra 18-8860 fuel pump made from? The pump body is aluminum, chosen for its corrosion resistance in a marine engine environment.

How much does the 18-8860 fuel pump weigh? It weighs 1.82 pounds.

What are the dimensions of the 18-8860? The Sierra 18-8860 measures 4.6 x 6.9 x 5.2 inches.

How is the 18-8860 mounted on the engine? It uses a tank-mount configuration, consistent with the mechanical fuel pump design on covered MerCruiser 8.2L 502 V-8 engines.

Does the 18-8860 work on both carbureted and fuel-injected 8.2L engines? Yes, coverage includes both the 8.2L MIE (carbureted) 502 V-8 for 1993-1996 and the 8.2L MPI MIE (multi-port fuel injected) 502 V-8 for 1996-1997, provided the engine serial number falls within the listed range for each.

Is the Sierra 18-8860 a direct replacement for the factory pump? Yes, it is built to original equipment specification as a direct replacement fuel pump for the applicable MerCruiser 8.2L 502 V-8 engine serial ranges.

What is included when I order the 18-8860? The Sierra 18-8860 fuel pump ships as a complete pump assembly ready for installation on the applicable MerCruiser 8.2L 502 V-8 engine.

Why does engine serial number matter when ordering the 18-8860? MerCruiser 8.2L 502 V-8 engines went through several fuel pump configurations across their production run, so the 18-8860 is only correct for engines within its specific D857200-F819619 or F819620-K147349 serial number ranges; engines outside those ranges require a different fuel pump.