Fuel Filter – Fits Mercury/Mariner Outboard 9.9-50HP (Replaces 35-8M0088825, 853733A2)
Fuel Filter – Fits Mercury/Mariner Outboard 9.9-50HP (Replaces 35-8M0088825, 853733A2) 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.).
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Fuel Filter – Fits Mercury/Mariner Outboard 9.9-50HP (Replaces 35-8...
Product Details
This is a high-quality water separating Fuel Filter – Fits Mercury/Mariner Outboard 9.9-50HP engines, including various 2-stroke and 4-stroke EFI models. It is designed to protect your marine engine by removing water, dust, and other contaminants from the fuel supply, ensuring reliable performance and preventing fuel system damage.
This filter serves as a direct replacement for Mercury part numbers 35-8M0088825, 853733A2, 853733T02, 853733T03, 35-853733A1, 853733A03 and Tohatsu 346-02230-0, 3B7-02230-0, and 3AD-02230-0.
- Installs in-line for easy access and replacement.
- Effectively separates water from gasoline to protect the fuel system.
- Includes one fuel filter for a complete service.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Mercury | 35-8M0088825 |
| Mercury | 853733A2 |
| Mercury | 853733T02 |
| Mercury | 853733T03 |
| Mercury | 35-853733A1 |
| Mercury | 853733A03 |
| Tohatsu | 346-02230-0 |
| Tohatsu | 3B7-02230-0 |
| Tohatsu | 3AD-02230-0 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This filter fits a wide range of Mercury and Mariner 2-stroke and 4-stroke EFI outboards from 9.9HP to 50HP.
It is also compatible with various Tohatsu and Nissan 25-40HP models. Please verify your specific part number.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Mercury | 9.9 (2 CYL.) | 9.9 | 2-Stroke | International | 35-8M0088825 | |
| Mercury | 15 (2 CYL.) | 15 | 2-Stroke | International | 35-8M0088825 | |
| Mercury | 18 (2 CYL.) | 18 | 2-Stroke | International | 35-8M0088825 | |
| Mercury | 25 (2 CYL.) | 25 | 2-Stroke | SN- 0N055505 & UP | 35-8M0088825 | |
| Mercury | 25 Jet (2 CYL.) | 25 | 2-Stroke | International | 35-8M0088825 | |
| Mercury | 25 EFI (3 CYL.) | 25 | 4-Stroke | 0R106999 & Up | 35-8M0088825 | |
| Mercury | 25 Carb SeaPro | 25 | 0R051710 & Up | 35-8M0088825 | ||
| Mercury | 30 (2 CYL.) | 30 | 2-Stroke | SN- 0N055505 & UP | 35-8M0088825 | |
| Mercury | 30 EFI (3 CYL.) | 30 | 4-Stroke | 0R106999 & Up | 35-8M0088825 | |
| Mercury | 40 (3 CYL.) | 40 | 2-Stroke | SN- 0N055505 & UP | 35-8M0088825 | |
| Mercury | 40 (International) | 40 | 2-Stroke | International | 35-8M0088825 | |
| Mercury | 40 LIGHTNING (International) | 40 | 2-Stroke | International | 35-8M0088825 | |
| Mercury | 40 LIGHTNING XR (International) | 40 | 2-Stroke | International | 35-8M0088825 | |
| Mercury | 40 MXL SEAPRO | 40 | 2-Stroke | 35-8M0088825 | ||
| Mariner | 40 LIGHTNING (International) | 40 | 2-Stroke | International | 35-8M0088825 | |
| Mariner | 40 LIGHTNING XR (International) | 40 | 2-Stroke | International | 35-8M0088825 | |
| Mariner | 40 MXL MARATHON | 40 | 2-Stroke | 35-8M0088825 | ||
| Mariner | 50MH | 50 | 2-Stroke | 35-8M0088825 | ||
| Tohatsu | Various | 25-40 | 2-Stroke & 4-Stroke | 346-02230-0, 3B7-02230-0, 3AD-02230-0 | ||
| Nissan | Various | 25-40 | 2-Stroke & 4-Stroke |
Technical Specs
- Product Type
- Water Separating Fuel Filter
- Installation
- In-line
- Fuel Type
- Gasoline
- Housing Material
- Plastic
- Housing Color
- White/Clear
- Dimensions
- 10.0 cm H x 7.5 cm W x 9.5 cm L
- Weight
- 0.19 kg (0.42 lb)
- Warranty
- 1 Year
- Other Technical Attributes
- Water separating capability
What’s in the Box
- 1 x Fuel Filter (Replaces 35-8M0088825/853733A2)
Installation Notes
- Turn off the engine and disconnect the battery. Relieve fuel system pressure according to your engine's service manual.
- Place a container under the old filter to catch any spilled fuel. Note the direction of fuel flow indicated by an arrow on the old filter.
- Loosen the clamps and detach the fuel lines from the old filter.
- Remove the old filter from its mounting bracket.
- Install the new filter, ensuring the fuel flow arrow points in the correct direction (towards the engine).
- Securely attach the fuel lines and tighten the clamps.
- Prime the fuel system as per your service manual, check for leaks, and reconnect the battery before starting the engine.
Troubleshooting & FAQ
How do I confirm this filter fits my specific engine model?
The best way to ensure a match is to compare the part number on your existing filter to the numbers listed in our Part Number Matrix. You can also check your engine's model, horsepower, and serial number against our compatibility table. When in doubt, consult your service manual or a qualified marine mechanic.
What is the recommended replacement interval?
For optimal engine 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 manufacturer-specific guidelines.
What are the signs of a clogged or failing fuel filter?
Common symptoms include engine hesitation, sputtering, loss of power, difficulty starting, or stalling. A visual inspection of the clear bowl may also show water or debris.
Can this filter be cleaned and reused?
No, this fuel filter is a disposable, single-use item. Attempting to clean it will not restore its filtration efficiency and can lead to fuel system contamination and engine damage. Always replace it with a new filter.
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.
Payment & Security
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