Inline Fuel Filter Assembly – Fits Mercury/Mariner Outboard 30-60HP (Replaces 35-879884T, 879884T)

Inline Fuel Filter Assembly – Fits Mercury/Mariner Outboard 30-60HP (Replaces 35-879884T, 879884T)

This inline cartridge fuel filter assembly is designed for Mercury and Mariner 4-Stroke EFI outboard engines from 30HP to 60HP, model years 2000 and newer with serial numbers 0T409000 and above. Its translucent bowl allows for easy visual inspection of fuel condition, helping to prevent engine damage from contaminated fuel.

It serves as a direct replacement for several OEM and aftermarket part numbers, ensuring broad compatibility for under-cowl installation.

• Filtration Rating: 20 micron
• Installation Type: Under-cowl, inline
• Housing: Features a translucent bowl for at-a-glance fuel inspection.

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 x Cartridge Type Fuel Filter Assembly (879884T)

Installation Guide

1. Safety First: Turn off the engine and let it cool. Disconnect the battery and ensure the area is well-ventilated.
2. Locate Filter: Find the current fuel filter assembly located under the engine cowl. Place a rag or drip pan underneath to catch fuel spillage.
3. Disconnect Fuel Lines: Carefully loosen the clamps and disconnect the inlet and outlet fuel hoses from the old filter. Take note of their positions.
4. Remove Old Filter: Unscrew or unclip the old filter from its mounting bracket and remove it.
5. Install New Filter: Mount the new filter assembly, ensuring it is oriented correctly according to fuel flow indicators.
6. Reconnect Fuel Lines: Securely attach the fuel hoses to the correct ports on the new filter and tighten the clamps.
7. Prime System: Reconnect the battery. Squeeze the primer bulb until it feels firm to fill the new filter with fuel.
8. Check for Leaks: Start the engine and let it run for a few minutes, carefully inspecting the filter and connections for any signs of fuel leaks.

Troubleshooting & FAQ

Q: How can I be sure this filter fits my specific Mercury engine?

A: This filter fits most Mercury and Mariner 4-stroke EFI outboards from 30HP to 60HP manufactured from 2000 onwards (serial numbers 0T409000 and up). The best way to confirm is to check your engine's serial number against the ranges listed in our compatibility table and verify your original part number matches 35-879884T or 879884T.

Q: How often should I replace my fuel filter?

A: For optimal engine health, we recommend replacing the fuel filter annually or every 100 hours of use, whichever occurs first. You should replace it immediately if you see significant water or debris in the bowl or experience poor engine performance.

Q: What is the benefit of the translucent bowl on this filter?

A: The clear, translucent bowl provides an immediate visual check of your fuel's integrity. It allows you to easily spot water, rust, sediment, or other contaminants, enabling you to address fuel quality issues before they can cause damage to your fuel pump or engine.

Q: OEM vs. Aftermarket?

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.