Cartridge Fuel Filter – Fits Mercury/Mariner Outboard 30-60 HP 3/4 Cylinder EFI (Replaces 35-879884T)

Cartridge Fuel Filter – Fits Mercury/Mariner Outboard 30-60 HP 3/4 Cylinder EFI (Replaces 35-879884T)

This cartridge fuel filter is a direct replacement for Mercury and Mariner 30-60 HP 4-Stroke EFI outboard engines, including both 3-cylinder and 4-cylinder models. It is designed to protect your fuel system from contaminants like water, dirt, and debris.

This assembly directly replaces Mercury/Mariner part numbers 35-879884T and 879884T, ensuring a precise fit and reliable performance.

• Engineered for under-cowl, inline installation.
• Features a translucent bowl to easily monitor fuel content and trapped debris.
• Provides 20-micron filtration for gasoline fuel 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

• 1 x Cartridge Fuel Filter Assembly (35-879884T)

Installation Guide

1. Safety First: Turn off the engine and disconnect the battery. Ensure the workspace is well-ventilated.
2. Locate Filter: Find the existing fuel filter assembly located under the engine cowl.
3. Relieve Fuel Pressure: Carefully relieve the pressure from the fuel lines to prevent spills.
4. Disconnect Lines: Place a rag under the filter to catch any excess fuel and disconnect the inlet and outlet fuel lines.
5. Remove Old Filter: Un-mount the old filter assembly. Note its orientation.
6. Install New Filter: Mount the new filter assembly in the same orientation as the old one.
7. Reconnect Lines: Securely attach the fuel lines to the new filter, ensuring they are correctly connected (inlet/outlet).
8. Prime System: Prime the fuel system according to your engine manufacturer's procedure.
9. Check for Leaks: Reconnect the battery. Start the engine and carefully inspect the filter and connections for any fuel leaks.

Troubleshooting & FAQ

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

A: First, check the compatible models listed in the table above. This filter fits specific Mercury and Mariner 30-60 HP 4-Stroke EFI models and directly replaces OEM part 35-879884T. For Mercury owners, we recommend using our Mercury Serial Number Guide to verify your exact model and year before ordering.

Q: How can I tell when the filter needs to be replaced?

A: Visually inspect the translucent bowl for water or significant debris. Common signs that your filter is clogged and needs replacement include engine hesitation, sputtering, loss of power, or difficulty starting. For best results, we recommend replacing the filter annually as part of your regular engine maintenance schedule.

Q: Is this filter difficult to install?

A: Installation is straightforward for those with basic mechanical skills. The filter is an inline, under-cowl unit. However, because you are working with the fuel system, we strongly recommend professional installation if you are not completely comfortable with the procedure.

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.