Cartridge Fuel Filter – Fits Mercury/Mariner 30-60 HP Outboards (Replaces 35-879884T, 879884T)

Cartridge Fuel Filter – Fits Mercury/Mariner 30-60 HP Outboards (Replaces 35-879884T, 879884T)

This cartridge fuel filter assembly fits Mercury/Mariner 30-60 HP 4-Stroke EFI engines, including 3-cylinder and 4-cylinder models with screw-on filter bowls mounted under the engine cowl.

This unit is a direct replacement for Mercury part numbers 35-879884T and 879884T, ensuring proper fit and function.

• Provides essential 20-micron filtration to protect sensitive fuel system components.
• Features a translucent bowl for at-a-glance visual inspection of fuel content and trapped debris.
• Designed for simple, direct installation in the factory under-cowl location.

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 (35-879884T/879884T)

Explosion Diagram

Installation Guide

1. Safety First: Ensure the engine is completely off and has cooled down.
2. Relieve Fuel Pressure: Follow your manufacturer's procedure for relieving fuel system pressure.
3. Locate Filter: Find the fuel filter assembly mounted under the engine cowl. Place a rag beneath it to catch any fuel spillage.
4. Remove Bowl: Carefully unscrew the translucent filter bowl from the upper housing.
5. Replace Cartridge: Remove the old filter cartridge. Clean the bowl of any sediment or water.
6. Install New Filter: Place the new filter into the housing, ensuring it is seated correctly.
7. Reassemble: Screw the bowl back onto the housing until it is hand-tight. Do not overtighten.
8. Prime System: Prime the fuel system by squeezing the primer bulb until firm.
9. Check for Leaks: Visually inspect the filter assembly for any signs of fuel leaks before starting the engine.

Troubleshooting & FAQ

Q: How do I confirm this filter fits my engine?

A: This filter is designed for Mercury/Mariner 30-60 HP 4-Stroke EFI engines that use a screw-on filter bowl located under the engine cowl. The best way to ensure compatibility is to visually match your old part to our images and cross-reference your part number with 35-879884T or 879884T.

Q: What is the filtration rating and why is it important?

A: This filter provides 20-micron filtration, which is critical for protecting modern EFI outboards. It effectively removes fine debris and contaminants from the fuel, preventing damage to sensitive components like fuel injectors.

Q: How often should I replace this fuel filter?

A: For optimal engine health and performance, we recommend replacing the fuel filter at least once per season or every 100 hours of operation, whichever comes first. Always consult your engine’s service manual for the recommended maintenance schedule.

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.