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-quality in-line Fuel Filter – Fits Mercury/Mariner 75-300 HP Outboards & MerCruiser 4.5L/6.2L is designed for a broad range of Mercury/Mariner and MerCruiser engines. It is compatible with 75-300 HP 2-Stroke (Optimax) and 4-Stroke (Verado) outboards from 2004–2018, as well as MerCruiser 4.5L and 6.2L sterndrive models.
This part is a direct replacement for Mercury part numbers 35-8M0122423, 35-8M0060041, 35-8M0020349, and 35-884380T. It also interchanges with Sierra 18-7981 and Mallory 9-37970.
- Engineered for in-line installation.
- Manufactured to meet or exceed OEM specifications.
- Provides reliable filtration for gasoline fuel systems.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket brands.
| Brand | Part Number | Notes |
|---|---|---|
| Mercury | 35-8M0122423 | Replaces 35-8M0060041, 35-8M0020349, 35-884380T |
| Sierra | 18-7981 | Aftermarket Interchange |
| Mallory | 9-37970 | Aftermarket Interchange |
Engine & Model Compatibility
Confirm your engine model and year in the tables below.
Fits various Mercury and Mariner 2-stroke and 4-stroke outboards from 75 to 400 HP.
| 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 | 135 | 4-Stroke | 2006–2009 | 35-8M0122423 | |
| Mercury | 4-Cylinder | 150 | 4-Stroke | 2006–2018 | 35-8M0122423 | |
| Mercury | 4-Cylinder | 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 | 200 | 4-Stroke | 2005–2014 | 35-8M0122423 | |
| Mercury | 6-Cylinder | 225 | 4-Stroke | 2005–2014 | 35-8M0122423 | |
| Mercury | 6-Cylinder | 250 | 4-Stroke | 2005–2014 | 35-8M0122423 | |
| Mercury | 6-Cylinder | 275 | 4-Stroke | 2005–2010 | 35-8M0122423 | |
| Mercury | 6-Cylinder | 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 |
Application data for MerCruiser 4.5L and 6.2L sterndrive engines.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| MerCruiser | 4.5L Engine | - | 4-Stroke | 35-8M0122423 | ||
| MerCruiser | 6.2L Engine | - | 4-Stroke | 35-8M0122423 |
Technical Specs
- Product Type
- Fuel Filter
- Installation
- In-line
- Fuel Type
- Gasoline
- Connection
- Direct fit OEM replacement
- Housing Color
- Red
- Other Technical Attributes
- High quality, manufactured to OEM specifications
What’s in the Box
- 1 x Fuel Filter (Replaces 35-8M0122423, 35-8M0060041, 35-884380T)
Installation Notes
- Ensure the engine is off and cool to the touch. Work in a well-ventilated area away from sparks or flames.
- Locate the existing fuel filter. Place rags or an absorbent pad underneath to catch any spilled fuel.
- Carefully relieve pressure from the fuel system according to the manufacturer’s service manual.
- Disconnect the fuel lines from both ends of the old filter. Note the direction of fuel flow, usually indicated by an arrow on the filter housing.
- Remove the old filter from its mounting bracket, if applicable.
- Compare the new filter to the old one to ensure an identical match.
- Install the new filter, making sure the arrow points in the correct direction of fuel flow (towards the engine).
- Securely reconnect the fuel lines. Ensure fittings are tight to prevent leaks.
- Prime the fuel system if required by your engine model.
- Start the engine and carefully inspect the filter and connections for any signs of leaks.
Troubleshooting & FAQ
How do I confirm this filter fits my specific engine model?
The most reliable method is to match the part number from your old filter to one of the numbers listed in our Part Number Matrix. You can also consult the Engine & Model Compatibility tables. If you are still unsure, please contact us with your engine's year, model, and serial number before ordering.
What is the recommended replacement interval?
For optimal engine performance and protection, it is recommended to replace your fuel filter annually or every 100 hours of operation, whichever comes first. Refer to your owner's manual for manufacturer-specific recommendations.
What are the signs of a clogged or failing fuel filter?
Common symptoms include engine hesitation, loss of power, stalling, difficulty starting, or rough idling. If you notice any of these issues, a restricted fuel filter may be the cause.
Why is this filter red like the OEM Optimax/Verado filter?
The red color is a visual identifier for this specific type of filter used in Mercury's high-performance Optimax, Verado, and newer MerCruiser engines. Our aftermarket filter matches this color for easy identification and replacement.
Is this a high-pressure or low-pressure filter?
This is a high-pressure fuel filter designed for use in modern fuel-injected (EFI) marine engines like the Optimax, Verado, and newer MerCruiser models which operate at higher fuel pressures.
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 and specifications against your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement part, 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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