35-879884T Fuel Filter for Mercury | JLM Marine

Fuel Filter Assembly for Mercury 4-Stroke Outboard Engines – 30HP to 60HP

This fuel filter assembly is engineered for Mercury 4-stroke EFI outboard engines ranging from 30HP to 60HP. Designed to maintain optimal fuel flow and protect your engine from contaminants, this component ensures reliable performance for 3 & 4 cylinder EFI models with serial numbers 0T409000 and above.

This aftermarket replacement directly substitutes OEM part numbers 35-879884T and 879884T, offering seamless fitment and dependable filtration for your Mercury outboard motor.

• Complete filter assembly – ready to install
• Fits Mercury 3 & 4 cylinder EFI 4-stroke outboards (s/n: 0T409000+)
• Direct replacement for Mercury OEM fuel filter systems

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

This package includes:

• 1 x Fuel Filter Assembly (complete with all components shown in product images)

Installation Guide

1. Ensure the engine is off and cool. Disconnect the battery to prevent accidental ignition.
2. Relieve fuel system pressure by loosening the fuel filter cap slowly. Have a rag ready to catch any residual fuel.
3. Locate the existing fuel filter assembly on your Mercury outboard engine.
4. Disconnect the fuel lines from the inlet and outlet of the old filter. Note the direction of fuel flow (usually marked with an arrow).
5. Remove the mounting bracket or clamp securing the old filter assembly.
6. Install the new fuel filter assembly in the same orientation, ensuring the fuel flow direction matches the arrow on the filter body.
7. Reconnect the fuel lines to the inlet and outlet fittings, ensuring all connections are snug and secure.
8. Secure the filter assembly with the mounting bracket or clamp.
9. Reconnect the battery and turn the ignition key to the "ON" position (do not start the engine yet) to prime the fuel system.
10. Check all connections for fuel leaks. Tighten any fittings if necessary.
11. Start the engine and let it idle for a few minutes. Monitor for any leaks or irregular performance.
12. Dispose of the old filter properly according to local environmental regulations.

Troubleshooting & FAQ

Q: How do I confirm this fuel filter fits my Mercury outboard?
A: Verify that your engine is a Mercury 30-60HP 4-stroke EFI model (3 or 4 cylinder) with serial number 0T409000 or higher. Cross-check your current filter's OEM number against 35-879884T or 879884T. If your existing part matches and your model is listed, this filter will fit.

Q: How often should I replace my fuel filter?
A: Mercury recommends inspecting your fuel filter every 100 hours of operation or annually, whichever comes first. Replace it if you notice reduced performance, difficulty starting, or visible contamination. Regular replacement helps prevent fuel system issues and maintains engine efficiency.

Q: What are the signs that my fuel filter needs replacement?
A: Common symptoms include engine sputtering or stalling under load, difficulty starting, reduced power output, rough idling, or visible debris/discoloration in the filter element. If you experience any of these issues, inspect and replace the fuel filter as needed.

Q: Can I use this filter on Mercury 2-stroke engines?
A: No, this fuel filter assembly is specifically designed for Mercury 4-stroke EFI outboards (30-60HP, serial number 0T409000+). Do not install it on 2-stroke engines or models outside the specified compatibility range.

Q: Is this an OEM or aftermarket part?
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.