Fellowes Mechanical Marine Fuel Pump for GM 5.0/5.7 (305/350) — Gasket Included, OEM Port Match

A direct-replacement mechanical fuel pump designed for GM 5.0 (305) and 5.7 (350) marine engines, supplied with a gasket and engineered to match Mercruiser and OMC port configurations.

This B. Marine mechanical fuel pump fits many Chevrolet-derived marine powerplants used in boats, including common Mercruiser and OMC applications. It’s built to replace specific factory part numbers while keeping inlet and outlet orientation consistent with original installations, and a gasket is included for a straightforward fit. The pump is intended for marine environments where correct port location and reliable fuel delivery are essential for engine performance and serviceability.

Will this pump fit my GM 5.0 or 5.7 marine engine?

If your vessel uses a Chevrolet-based 305 or 350 marine engine, this mechanical fuel pump is manufactured to match those configurations. It replaces several OEM Mercruiser and OMC part numbers so you can cross-reference compatibility before ordering.

• Designed for GM (Chevy) Marine 5.0 (305) and 5.7 (350) engines
• Replaces Mercruiser 861678A, 861678A1, 97401A2, 8M0058164
• Cross-references OMC 509404 for OMC-powered boats
• Gasket included to match factory sealing requirements

How do I check inlet and outlet port orientation before installation?

Port orientation matters for hose routing and preventing fuel line stress. Compare the new pump’s inlet and outlet positions to your existing pump or engine manifold so hoses reach without kinking.

• Visually verify inlet/outlet locations on your current pump
• Confirm hose length and route are compatible with the pump’s ports
• Ensure pump mounts align with existing bolt pattern
• Use the included gasket for correct sealing and alignment

What are the key benefits and replacement part advantages?

This pump provides a like-for-like replacement for worn or damaged factory units, restoring mechanical fuel delivery to carbureted marine engines. It’s supplied with the necessary gasket and made to match OEM specifications for a clean, reliable swap-out.

• OEM cross-reference compatibility reduces selection errors
• Included gasket simplifies installation and leak prevention
• Manufactured to match inlet/outlet placement of original units
• Helps maintain proper fuel flow for carbureted engines

Are there installation tips or maintenance notes I should follow?

Installation is straightforward for a mechanically driven pump but must be done with care to ensure safety and long service life. Always work with a cool engine, clean mounting surfaces, and double-check fittings and torque specifications.

• Replace the old gasket with the included new gasket to prevent leaks
• Clean mating surfaces and inspect mounting studs for wear
• Verify hose clamps are corrosion-resistant for marine use
• Prime the system and check for leaks before starting the engine

Who is this product for: This mechanical fuel pump is intended for boat owners, marine mechanics, and restoration projects that use Chevrolet-based 5.0 (305) or 5.7 (350) marine engines and require a dependable OEM-compatible replacement. It’s especially useful when your original pump shows signs of wear, leakage, or incorrect pressure delivery, and for anyone who needs a direct-fit part that replaces common Mercruiser and OMC numbers while keeping correct port orientation and a gasket supplied for proper sealing.