Fuel Filter – Fits Mercury/Mariner 75-300 HP Outboards & MerCruiser 4.5L/6.2L (Replaces 35-8M0122423, 35-8M0060041)
Fuel Filter – Fits Mercury/Mariner 75-300 HP Outboards & MerCruiser 4.5L/6.2L (Replaces 35-8M0122423, 35-8M0060041) 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/Mariner 75-300 HP Outboards & MerCru...
Product Details
This high-efficiency Fuel Filter – Fits Mercury/Mariner 75-300 HP Outboards & MerCruiser 4.5L/6.2L (Replaces 35-8M0122423, 35-8M0060041) is an essential component for protecting your engine's sensitive fuel system. It is designed for a broad range of Mercury and Mariner outboards from 75 to 300 HP (including OptiMax and Verado models from 2003–2018) and MerCruiser 4.5L and 6.2L sterndrive engines with serial numbers 2A456613 and newer.
This filter serves as a direct cross-reference for multiple OEM and aftermarket part numbers, including Mercury 35-8M0122423, 35-8M0060041, 35-8M0020349, 35-884380T, Sierra 18-7981, and Mallory 9-37970.
- Installs directly under the cowl for easy access.
- Features a 2-micron filter media to capture the smallest contaminants.
- Includes one filter element for a complete replacement.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Mercury | 35-8M0122423 |
| Mercury | 35-8M0060041 |
| Mercury | 35-8M0020349 |
| Mercury | 35-884380T |
| Sierra | 18-7981 |
| Mallory | 9-37970 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
Mercury/Mariner Outboards: This filter fits a wide range of 2-stroke OptiMax and 4-stroke Verado models. Please verify your engine's horsepower, cylinder count, and production year.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Mercury | 3-Cylinder OptiMax | 75 | 2-Stroke | 2004–2014 | 35-8M0122423 | 1.5L, 3.6255 Bore |
| Mercury | 3-Cylinder OptiMax | 80 | 2-Stroke | 2007–2014 | 35-8M0122423 | 1.5L, 3.6255 Bore |
| Mercury | 3-Cylinder OptiMax | 90 | 2-Stroke | 2004–2014 | 35-8M0122423 | 1.5L, 3.6255 Bore |
| Mercury | 3-Cylinder OptiMax | 115 | 2-Stroke | 2004–2014 | 35-8M0122423 | 1.5L, 3.6255 Bore |
| Mercury | 3-Cylinder OptiMax | 125 | 2-Stroke | 2006–2012 | 35-8M0122423 | 1.5L, 3.6255 Bore |
| Mercury | 4-Cylinder Verado | 135 | 4-Stroke | 2006–2009 | 35-8M0122423 | |
| Mercury | 4-Cylinder Verado | 150 | 4-Stroke | 2006–2018 | 35-8M0122423 | |
| Mercury | 4-Cylinder Verado | 175 | 4-Stroke | 2006–2014 | 35-8M0122423 | |
| Mercury | 6-Cylinder OptiMax | 200 | 2-Stroke | 2003–2018 | 35-8M0122423 | 3L, 3.6265 Bore |
| Mercury | 6-Cylinder OptiMax Pro XS | 200 | 2-Stroke | 2007–2018 | 35-8M0122423 | 3L, 3.6265 Bore |
| Mercury | 6-Cylinder OptiMax | 225 | 2-Stroke | 2003–2018 | 35-8M0122423 | 3L, 3.6265 Bore |
| Mercury | 6-Cylinder OptiMax Pro XS | 225 | 2-Stroke | 2004–2010 | 35-8M0122423 | 3L, 3.6265 Bore |
| Mercury | 6-Cylinder OptiMax | 250 | 2-Stroke | 2004–2014 | 35-8M0122423 | 3L, 3.6265 Bore |
| Mercury | 6-Cylinder OptiMax Pro XS | 250 | 2-Stroke | 2006–2010 | 35-8M0122423 | 3L, 3.6265 Bore |
| Mercury | 6-Cylinder OptiMax | 300 | 2-Stroke | 2015–2018 | 35-8M0122423 | 3L, 3.6265 Bore |
| Mercury | 6-Cylinder Verado | 200 | 4-Stroke | 2005–2014 | 35-8M0122423 | |
| Mercury | 6-Cylinder Verado | 225 | 4-Stroke | 2005–2014 | 35-8M0122423 | |
| Mercury | 6-Cylinder Verado | 250 | 4-Stroke | 2005–2014 | 35-8M0122423 | |
| Mercury | 6-Cylinder Verado | 275 | 4-Stroke | 2005–2010 | 35-8M0122423 | |
| Mercury | 6-Cylinder Verado | 300 | 4-Stroke | 2007–2014 | 35-8M0122423 | |
| Mercury | 6-Cylinder Verado | 350 | 4-Stroke | 2009–2014 | 35-8M0122423 | 3.2283 Bore |
| Mercury | 6-Cylinder Verado | 400 | 4-Stroke | 2015–2018 | 35-8M0122423 | 3.2283 Bore |
MerCruiser Sterndrives: Fits modern 4.5L and 6.2L MPI engines manufactured from 2015 onwards. Fitment is determined by serial number.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| MerCruiser | 4.5L MPI Alpha/Bravo | 200 | 4-Stroke | 2015+ | 35-8M0122423 | S/N 2A456613 and newer |
| MerCruiser | 4.5L MPI Alpha/Bravo | 250 | 4-Stroke | 2015+ | 35-8M0122423 | S/N 2A456613 and newer |
| MerCruiser | 6.2L MPI | Various | 4-Stroke | 2015+ | 35-8M0122423 | S/N 2A456613 and newer |
Technical Specs
- Product Type
- Fuel Filter Element
- Installation
- In-line / Under-cowl
- Filtration Rating
- 2 micron
- Fuel Type
- Gasoline (including ethanol blends)
- Connection
- Direct fit OEM replacement / Screw-in cartridge
- Housing Material
- Plastic with filter media
- Housing Color
- Red/Burgundy
- Dimensions
- 20.0 L x 20.0 W x 7.0 H
- Fitting Type
- Screw-in
- Other Attributes
- For engines with vapor separator systems
What’s in the Box
- 1 x Fuel Filter Element (35-8M0122423/35-8M0060041/35-884380T)
Installation Notes
Before beginning, ensure the engine is off and cool, and disconnect the battery for safety. Relieve any pressure in the fuel system according to your engine's service manual. Place an absorbent shop towel or rag under the filter housing to catch fuel spillage. Carefully unscrew the old filter element. Lightly lubricate the gasket on the new filter with clean engine oil, then install and tighten it by hand until snug. Do not overtighten. Reconnect the battery, prime the fuel system as required by the manufacturer, and carefully check for leaks before starting the engine.
Troubleshooting & FAQ
How do I confirm this filter fits my specific engine model?
Always check your engine's serial number and model year against the compatibility tables provided on this page. For MerCruiser engines, fitment begins with serial number 2A456613. For outboards, confirm the HP, model (e.g., OptiMax, Verado), and year range.
What is the recommended replacement interval for this fuel filter?
For optimal engine health and performance, we recommend replacing your fuel filter annually or every 100 hours of operation, whichever comes first. This interval may be shorter if you frequently use fuel with high ethanol content or operate in environments with contaminated fuel sources.
What are common signs that my fuel filter needs replacement?
Symptoms of a clogged or failing fuel filter include engine hesitation, loss of power, difficulty starting, rough idling, and stalling. If you notice any of these issues, inspect and replace the filter as a primary troubleshooting step.
Is this a direct screw-in replacement?
Yes, this is a cartridge-style filter element designed for a direct, screw-in fit into the existing under-cowl fuel filter housing or vapor separator tank (VST) on compatible models. No special modifications are required.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). It is built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, it is batch-inspected for consistency.
Shipping speed & cost?
We ship worldwide quickly—typical transit is 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns?
This product is 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 if the item is unused and in its original condition. See our policy page or reach out for instructions.
Safety & Important Info
- Verify images and specifications against 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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