In-line Fuel Filter – Fits Mercury/Mariner 30-350 HP EFI Outboards (Replaces 35-879885Q, 35-879885T, 35-879885K)

In-line Fuel Filter – Fits Mercury/Mariner 30-350 HP EFI Outboards (Replaces 35-879885Q, 35-879885T, 35-879885K)

This in-line fuel filter is designed for a wide range of Mercury/Mariner 4-Stroke outboards from 30 to 350 HP, including EFI and Verado models (1996 and newer). It also provides compatibility with select Yamaha 2-Stroke and 4-Stroke outboard engines from 1984 and newer, ensuring broad application coverage.

This component is a direct replacement for multiple OEM and aftermarket part numbers, designed to meet or exceed original specifications for filtration and performance. It effectively removes contaminants from the fuel system to protect sensitive engine components.

• Installation: Installs under the cowl as an in-line filter.
• Filtration: Rated for 20–30 micron filtration to capture fine particles.
• Fuel Compatibility: Approved for use with gasoline and ethanol blends (e.g., E10).

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.

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

Mercury/Mariner

Yamaha

Technical Specifications

Package Contents

• 1 x In-Line Fuel Filter (Replaces 35-879885Q, 35-879885T, 35-879885K)

Installation Guide

1. Turn off the engine and disconnect the battery. Allow the engine to cool completely.
2. Locate the existing in-line fuel filter under the engine cowl.
3. Place a rag or container under the filter to catch any spilled fuel.
4. Carefully loosen the clamps and disconnect the fuel lines from both ends of the old filter. Note the direction of the fuel flow arrow.
5. Remove the old filter from its mounting bracket, if applicable.
6. Install the new filter, ensuring the fuel flow arrow points in the correct direction (towards the engine).
7. Securely attach the fuel lines to the new filter using the original clamps. Ensure they are tight to prevent leaks.
8. Reconnect the battery.
9. Prime the fuel system by squeezing the primer bulb until it is firm.
10. Check for any fuel leaks around the filter and its connections.
11. Start the engine and let it run for a few minutes while continuing to check for leaks.

Troubleshooting & FAQ

Q: How can I confirm this filter fits my specific engine?
A: The best way to ensure fitment is to check your OEM part number. This filter replaces Mercury/Mariner part numbers 35-879885Q, 35-879885T, 35-879885K and Yamaha 6G1-13621-00-00, among others listed in our cross-reference table. You can also consult our compatibility tables and use our serial number guides to verify your model and year.

Q: How often should I replace my in-line fuel filter?
A: For optimal engine performance and protection, it is recommended to replace your fuel filter annually or every 100 hours of operation, whichever comes first. Refer to your engine’s service manual for specific maintenance intervals.

Q: What are the signs of a clogged or failing fuel filter?
A: Common symptoms include engine hesitation, sputtering, loss of power, difficulty starting, or stalling, especially under load. A visual inspection may show debris inside the translucent housing.

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.