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) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Fuel Filter Element – Fits Mercury/Mariner 6-60 HP 2-Stroke Outboar...
Product Details
This premium under-cowl Fuel Filter Element – Fits Mercury/Mariner 6-60 HP 2-Stroke Outboards and ensures your engine receives clean, particle-free fuel for optimal performance. Designed for use inside the screw-on filter bowl, it effectively protects critical engine components from contaminants found in gasoline.
It serves as a direct replacement for multiple OEM and aftermarket part numbers, including Mercury 87946Q04, 35-87946A3, and Sierra 18-7802.
- Installs under the cowl inside the screw-on filter bowl.
- Replaces the older white plastic filter element for improved filtration.
- Includes the necessary gasket for a leak-free seal.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Mercury | 87946Q04 |
| Mercury | 35-87946A3 |
| Mercury | 35-87946K04 |
| Mercury | 35-87946Q3 |
| Mercury | 87946T3 |
| Quicksilver | 87946Q04 |
| Sierra | 18-7802 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This filter element is designed for a wide range of 2-stroke outboards from Mercury and Mariner.
| Brand | Model | Rated HP | Stroke | OEM Part No. |
|---|---|---|---|---|
| Mercury/Mariner | Various | 6 | 2-Stroke | 87946Q04, 35-87946A3 |
| Mercury/Mariner | Various | 8 | 2-Stroke | 87946Q04, 35-87946A3 |
| Mercury/Mariner | Various | 9.9 | 2-Stroke | 87946Q04, 35-87946A3 |
| Mercury/Mariner | Various | 10 | 2-Stroke | 87946Q04, 35-87946A3 |
| Mercury/Mariner | Various | 13.5 | 2-Stroke | 87946Q04, 35-87946A3 |
| Mercury/Mariner | Various | 15 | 2-Stroke | 87946Q04, 35-87946A3 |
| Mercury/Mariner | Various | 20 | 2-Stroke | 87946Q04, 35-87946A3 |
| Mercury/Mariner | Various | 25 | 2-Stroke | 87946Q04, 35-87946A3 |
| Mercury/Mariner | Various | 45 | 2-Stroke | 87946Q04, 35-87946A3 |
| Mercury/Mariner | Various | 50 | 2-Stroke | 87946Q04, 35-87946A3 |
| Mercury/Mariner | Various | 60 | 2-Stroke | 87946Q04, 35-87946A3 |
Technical Specs
- Product Type
- Inline Fuel Filter Element
- Installation
- Under-cowl, inside screw-on filter bowl
- Fuel Type
- Gasoline
- Connection
- Fits inside inline filter housing
- Weight
- 10 grams (0.35 oz)
- Fitting Type
- Cartridge element with gasket
- Other Technical Attributes
- Replaces older white plastic filter element
What’s in the Box
- 1 x In-Line Fuel Filter Element (87946Q04)
- 1 x Gasket
Installation Notes
- Ensure the engine is off and cool. Shut off the fuel supply and place a rag under the filter to catch any spills.
- Locate the fuel filter housing, which is typically a clear or black plastic screw-on bowl found under the engine cowl.
- Carefully unscrew the filter bowl. Note the orientation of the old filter and gasket.
- Remove the old filter element and gasket. Clean the inside of the bowl with a lint-free cloth.
- Install the new gasket and place the new filter element inside the bowl.
- Screw the bowl back onto the housing, ensuring it is hand-tight. Do not overtighten.
- Restore the fuel supply, prime the engine if necessary, and check for any leaks around the filter housing before starting the engine.
Troubleshooting & FAQ
Does this filter fit my specific engine model and year?
This filter is designed for a broad range of Mercury/Mariner 6–60 HP 2-stroke outboards. The best way to confirm is to match your existing part number to one of the cross-reference numbers listed in our Part Number Matrix, such as 87946Q04 or 35-87946A3.
What are the signs of a clogged or failing fuel filter?
Common symptoms include engine hesitation, sputtering, difficulty starting, rough idling, or a loss of power at high speeds. If you notice any of these issues, a clogged fuel filter is a likely cause.
How often should I replace my outboard fuel filter?
For optimal engine health, it is recommended to replace your fuel filter at least once per season or every 100 hours of operation, whichever comes first. Consult your engine's service manual for specific maintenance intervals.
What is the difference between this filter and the original OEM part?
This aftermarket filter is designed to meet or exceed OEM specifications for fit, form, and function. It provides comparable filtration and performance to the original Mercury or Quicksilver part but at a more accessible price point. It directly replaces the older white plastic elements.
Can I clean and reuse this filter element?
No, this filter element is designed for single use and should not be cleaned or reused. Attempting to clean it can damage the filtration media and compromise its effectiveness, leading to potential engine damage.
Is the gasket for the filter bowl included?
Yes, a new gasket is included with the filter element to ensure a proper, leak-free seal upon installation.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.
Shipping speed & cost
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns
Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.
Safety & Important Info
- Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.
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