Fuel Filter – Fits Mercury/Mercruiser Marine Engines (Replaces 35-19486, 8M0103963)
Fuel Filter – Fits Mercury/Mercruiser Marine Engines (Replaces 35-19486, 8M0103963) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
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).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Fuel Filter – Fits Mercury/Mercruiser Marine Engines (Replaces 35-1...
Product Details
This in-line Fuel Filter – Fits Mercury/Mercruiser Marine Engines is designed for a variety of marine diesel engines manufactured from the 1990s through the 2010s. It ensures clean fuel delivery, protecting sensitive engine components from contaminants.
This part provides a direct interchange for Mercury/Mercruiser 35-19486, Sierra 18-7943, and NAPA 3519486, among other equivalents.
- Installation Method: In-line
- Primary Fuel Type: Diesel
- Housing: Durable Metal Construction
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Superseded By | Notes |
|---|---|---|---|
| Mercury/Mercruiser | 35-19486 | 35-8M0103963 | |
| Mercury/Mercruiser | 35-8M0103963 | Current OEM Number | |
| Sierra | 18-7943 | Aftermarket Cross-Reference | |
| NAPA | 3519486 | Aftermarket Cross-Reference | |
| Quicksilver | RM3519486 | Aftermarket Cross-Reference | |
| Luber-Finer | LFF3517 | Aftermarket Cross-Reference | |
| Hifi | SN438 / SN-438 | Aftermarket Cross-Reference |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Mercury/Mercruiser | Diesel Engines | 35-19486/8M0103963 | Superseded by 8M0103963 |
Technical Specs
- Product Type
- Fuel Filter
- Installation
- In-line
- Fuel Type
- Diesel
- Connection
- 16mm (5/8")
- Housing Material
- Metal
- Dimensions
- 14.0cm x 12.0cm x 14.0cm
- Thread Size
- 16mm x 1.5
What’s in the Box
- 1 x Fuel Filter (35-19486/8M0103963)
Installation Notes
- Shut off the fuel supply at the tank.
- Place an absorbent rag under the old filter to catch any spills.
- Loosen the clamps or fittings securing the fuel lines to the filter.
- Note the direction of the fuel flow arrow on the old filter.
- Gently remove the old filter and fuel lines.
- Install the new filter, ensuring the flow arrow points in the correct direction (towards the engine).
- Securely attach the fuel lines and tighten the clamps or fittings.
- Turn the fuel supply back on and prime the system if necessary.
- Start the engine and carefully inspect the filter and connections for any leaks.
Troubleshooting & FAQ
How do I confirm this filter fits my specific engine?
Check the Part Number Matrix and Engine Compatibility tables on this page against your current part number or service manual. This filter is designed for a wide range of Mercury/Mercruiser diesel engines, but verifying the part number is the most reliable method.
What are the signs of a clogged or failing fuel filter?
Common symptoms include engine hesitation, loss of power, rough idling, difficulty starting, or stalling. If you notice any of these issues, inspect your fuel filter as a potential cause.
What is the recommended replacement interval?
For most diesel marine engines, it is recommended to replace the fuel filter every 100 hours of operation or annually, whichever comes first. Refer to your engine's service manual for the precise maintenance schedule.
Do I need special tools for installation?
Typically, only basic hand tools such as a screwdriver or wrench are required to loosen and tighten the fuel line clamps or fittings. No specialized tools are usually necessary.
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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