Sierra International 18-7946 Fuel Water Separator Filter – 10 Micron, 1-12 Thread
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Description
xOverview
Designed to replace OMC 502905, the Sierra International 18-7946 Fuel Water Separator Filter combines a 10 micron filtration rating with a 1-12 inch thread to fit common marine fuel lines. This product is built for boats and outboard installations where clean fuel and water separation matter in daily operation.
In practical sailing and boating scenarios, maintaining fuel cleanliness can contribute to smoother starts and steadier idle, especially when engines operate in variable conditions. While outcomes depend on multiple factors, using a trusted Sierra part in the fuel path is a practical step many boaters consider as part of routine maintenance.
Key details
- Rating: 10 Micron
- Thread Pitch: 1-12 inch
- Replaces: OMC 502905
- Warranty: All Sierra parts qualify for Sierra's industry-leading customer satisfaction warranty
For fit and compatibility, refer to the product page guidance. To ensure this filter will work with your application, visit Amazon’s SONAR parts finder at fit-guideseastarsolutionscom.
Usage and potential benefits
Integrating the Sierra 18-7946 into the fuel path creates a barrier that helps separate water from fuel before it reaches the engine. Possible benefits include cleaner fuel delivery to the pump and injectors, reduced moisture in the fuel system, and more consistent fuel flow under varying operating conditions. These are possibilities rather than guarantees and depend on the broader health of your fuel system and operating environment.
- Compatible with marine fuel systems and Sierra parts ecosystem
- Designed for reliable performance in both saltwater and freshwater environments
Notes on fit and maintenance
Before purchasing, verify your system’s thread and compatibility. The thread pitch is listed as 1-12 inch, and this filter is intended as a replacement for OMC 502905. For support and warranty information, Sierra provides customer satisfaction assistance on this part.
Installation and care tips
Handle the new filter with clean hands, ensure seals are correctly seated, and replace during planned maintenance intervals to maintain filtration efficiency. A correctly installed filter supports steady fuel flow and helps minimize fuel-related interruptions during boating trips.
FAQ
Q: What is the Sierra 18-7946 fuel water separator filter?
A: A replacement filter with a 10 micron rating and 1-12 inch thread, designed to replace OMC 502905 in marine fuel systems.
Q: How can I verify it fits my engine?
A: Use Amazon's SONAR finder at fit-guideseastarsolutionscom to confirm compatibility with your application.
Shipping & Return
xReturns Policy
You may return most new, unopened items within 30 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.
Shipping
We can ship to virtually any address in the world. Note that there are restrictions on some products, and some products cannot be shipped to international destinations.
When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.
Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.
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