Fuel Filter Element – Fits Mercury/Mariner 6-60 HP 2-Stroke Outboards (Replaces 87946Q04, 35-87946A3)

Fuel Filter Element – Fits Mercury/Mariner 6-60 HP 2-Stroke Outboards (Replaces 87946Q04, 35-87946A3)

This fuel filter element is designed for use on Mercury and Mariner 6 HP to 60 HP 2-stroke outboard engines. It installs under the cowl inside the screw-on filter bowl, protecting the fuel system from contaminants.

This part directly replaces Mercury part numbers 87946Q04, 35-87946A3, 35-87946K04, 35-87946Q3, 87946T3; Quicksilver 87946Q04; and Sierra 18-7802.

• Installation Type: Installs under the engine cowl inside the screw-on fuel filter bowl.
• Compatibility: For gasoline-fueled 2-stroke Mercury/Mariner outboards (6-60 HP).
• Included Components: Comes with one filter element and one gasket for a complete replacement.

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 In-Line Fuel Filter Element (87946Q04)
• 1 x Gasket

Installation Guide

1. Safety First: Ensure the engine is turned off and cool to the touch.
2. Locate Filter: Find the screw-on fuel filter bowl located under the engine cowl.
3. Prepare for Spills: Place a rag or container under the filter bowl to catch any dripping fuel.
4. Remove Bowl: Carefully unscrew the filter bowl by hand.
5. Replace Element: Remove the old filter element and gasket. Take note of their orientation before discarding.
6. Clean Housing: Wipe the inside of the filter bowl with a clean, lint-free cloth.
7. Install New Gasket: Seat the new gasket properly in the filter bowl groove.
8. Install New Element: Place the new filter element inside the bowl, ensuring it is correctly positioned.
9. Re-attach Bowl: Screw the fuel filter bowl back on, hand-tightening until it is snug. Do not overtighten.
10. Prime System: Squeeze the primer bulb until firm to fill the filter with fuel.
11. Check for Leaks: Inspect the filter housing for any signs of fuel leaks before starting the engine.

Troubleshooting & FAQ

Q: How can I tell if this filter fits my engine?
A: This filter is designed for Mercury/Mariner 6-60 HP 2-stroke outboards. It replaces part numbers like 87946Q04 and 35-87946A3. Please check the "Compatible Engine Models" and "Part Number Cross-Reference" tables to confirm it matches your specific engine.

Q: How do I install this filter?
A: This is an under-cowl filter element that fits inside the screw-on filter bowl. Installation involves unscrewing the bowl, replacing the old element and gasket, and reassembling. See our step-by-step installation guide on this page for more details.

Q: What’s the difference between this part and the original Mercury part?
A: This is an aftermarket part engineered to meet or exceed OEM specifications for fit and performance. It serves as a direct replacement for the original element and is designed to replace the older white plastic filter style.

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 operation, whichever comes first. However, always consult your engine’s service manual for the manufacturer-specified maintenance intervals.

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.