8M0118177 Fuel Pump Assembly for Mercury Mariner 30HP 35HP 40HP 50HP 60HP EFI | JLM Marine

Fuel Pump Assembly – Fits Mercury Mariner 30HP 35HP 40HP 50HP 60HP EFI Outboard Engines

This fuel pump assembly is engineered to fit Mercury Mariner EFI outboard engines from 30 HP to 60 HP, including 3-cylinder and 4-cylinder configurations. Compatible models include the Mercury Mariner 30 HP EFI Jet (4 Cyl and 3 Cyl), 40 HP EFI Jet (4 Cyl), 50 HP EFI (4 Cyl), and 60 HP EFI (4 Cyl and SeaPro 4 Cyl) outboards.

This aftermarket replacement directly replaces OEM part number 8M0118177 and supersedes multiple Mercury part numbers including 808505T, 808505T01, 827682T, 881862T07, 892874T, 892874T01, 899106T, 899106T01, 8M0118176, 8M0141844, and Sierra 18-8866.

• Package includes fuel pump assembly with 3 cable ties for secure installation
• Designed for 4-stroke EFI outboard applications
• Note: This pump features two different hose connector configurations—verify compatibility with your original unit

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across OEM and aftermarket brands.

Compatible Engine Models

Confirm your engine model/year in the table below. For Mercury owners, here's a guide to help you identify your engine's serial/model: Mercury Serial Number Guide. You can also review exploded diagrams to verify part numbers: Mercury Parts Diagrams & Catalog.

Technical Specifications

Package Contents

• 1 × Fuel Pump Assembly
• 3 × Cable Ties
• Important: Verify hose connector configuration matches your original pump—this unit features two different connector types

Installation Guide

1. Preparation: Disconnect the battery and relieve fuel system pressure before beginning installation. Ensure the work area is well-ventilated and free from ignition sources.
2. Access: Remove engine cowling and locate the existing fuel pump assembly on your outboard motor. Take photos of hose connections for reference.
3. Disconnect Fuel Lines: Carefully disconnect fuel inlet and outlet hoses from the old pump. Have a container ready to catch any residual fuel.
4. Remove Electrical Connections: Unplug the electrical connector from the old fuel pump. Label wires if necessary for correct reinstallation.
5. Remove Old Pump: Unbolt the mounting hardware securing the fuel pump to the engine block. Remove the old pump assembly.
6. Install New Pump: Position the new fuel pump assembly in place and secure with original or new mounting bolts. Tighten to manufacturer specifications.
7. Connect Fuel Lines: Attach fuel inlet and outlet hoses to the new pump, ensuring correct orientation. Use the provided cable ties to secure connections firmly.
8. Reconnect Electrical: Plug the electrical connector into the new fuel pump, ensuring a secure and proper fit.
9. Inspection: Double-check all connections, hose clamps, and mounting bolts for tightness. Verify hose routing matches original configuration.
10. Prime System: Reconnect the battery and turn the ignition key to prime the fuel system without starting the engine. Check for fuel leaks at all connections.
11. Test Run: Start the engine and allow it to idle for several minutes. Monitor for smooth operation and verify no fuel leaks are present.
12. Final Check: Reinstall engine cowling and perform a brief on-water test to confirm proper fuel delivery and engine performance.

Troubleshooting & FAQ

Q: How do I confirm this fuel pump fits my specific Mercury engine?
A: Cross-reference your engine's model, horsepower, and cylinder count with the compatibility table above. Verify your original pump's part number matches one of the listed OEM numbers (8M0118177, 899106T01, 892874T01, etc.). Also confirm the hose connector configuration matches your current pump.

Q: What are the signs that my fuel pump needs replacement?
A: Common symptoms include difficulty starting the engine, loss of power at high RPM, engine surging or stalling, rough idling, or hearing unusual whining/buzzing noises from the pump. If you notice fuel leaks or the pump fails to prime, immediate replacement is recommended.

Q: How often should I replace the fuel pump on my outboard?
A: Fuel pumps typically last 3–5 years or 300–500 hours of operation, depending on fuel quality and usage conditions. Inspect the pump annually and replace if you notice performance issues or visible wear.

Q: Will this aftermarket pump perform the same as the original Mercury part?
A: Yes, this replacement is manufactured to meet OEM specifications for fit, pressure output, and flow rate. It uses comparable materials and is designed to deliver reliable performance equivalent to the original part.

Q: Do I need any special tools to install this fuel pump?
A: Basic hand tools are sufficient—socket set, screwdrivers, and pliers. You may need a fuel line disconnect tool depending on your engine's hose fittings. Always have a fuel-safe container and rags on hand.

Q: Is this an OEM part or an aftermarket replacement?
A: This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.

Q: How fast do you ship and how much does it cost?
A: We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.

Q: What is your warranty and return policy?
A: This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused & in original condition); please see our policy page or reach out for instructions.

Important Notes

• Verify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.
• This product is an aftermarket replacement part and is not an OEM component.
• Professional installation is recommended to ensure safety and optimal performance.

Why Choose JLM MARINE?

• Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
• Fast Global Shipping: Free delivery worldwide in 5–15 days.
• Direct from Manufacturer: Competitive pricing without compromising quality.