ELM S3227 Fuel Filter — Replaces Sierra 18-7948 | Fits 320RRAC01
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ELM S3227 Marine Fuel/Water Separator Element
- Part Number: S3227 (ELM)
- Brand: ELM
- Product Type: Spin-On Marine Fuel/Water Separator Element
- Micron Rating: 10 micron
- Thread Size: 1"-14
- Fits: Racor 320RRAC01 / 320R-RAC-01 fuel/water separator assemblies
ELM S3227 is a 10-micron spin-on fuel/water separator replacement element for Racor-style 320RRAC01 / 320R-RAC-01 marine gasoline fuel filtration assemblies. It removes water and fine contaminants from the fuel supply before they reach the engine, helping maintain clean fuel delivery and protecting fuel system components. The reusable collection bowl transfers from the old element to the new one when applicable.
Compatible Applications
Fits assemblies specifying the S3227-style 10-micron element:
- Racor 320RRAC01 / 320R-RAC-01 marine fuel/water separator (rated up to 60 GPH / 227 L/h)
- Any system cross-referencing Sierra 18-7948, Mercury 35-886638, or Racor S3227
Match the replacement element by existing filter number, housing series, thread size (1"-14), and micron rating. Filters with similar external dimensions may use different thread pitches or bowl configurations — always confirm the housing part number before ordering.
Cross-Reference Part Numbers
- ELM: S3227
- Racor: S3227
- Sierra: 18-7948
- Mercury: 35-886638
- Mercury: 35-8M0103096
- Honda: 17670-ZW1-801AH
- Suzuki: 99105-20005
When to Replace the Filter Element
- Water or visible contamination is present in the collection bowl
- Fuel flow becomes restricted or engine performance suggests fuel starvation
- The filter has reached the engine or manufacturer’s recommended service interval
- The vessel has been exposed to contaminated or water-affected fuel
- Start of season as part of routine fuel system maintenance
Note on ethanol-blended fuels: Ethanol-blended gasoline can absorb and carry water, increasing the rate at which the separator bowl fills. Inspect the bowl more frequently when operating on E10 or higher-ethanol fuels.
Installation Notes
- Shut off the fuel supply before beginning any filter service
- Remove the reusable collection bowl from the old element, inspect the bowl and O-ring seals, and transfer to the new element
- Lightly lubricate the sealing gasket with clean fuel before installation
- Hand-tighten the element per the filter manufacturer’s specification — do not overtighten
- Restore fuel flow and inspect the assembly carefully for leaks before operating the vessel
Parts Desk Insights
Best use case: S3227 is the correct annual service element for any boat running a Racor 320RRAC01 fuel/water separator. It’s an essential seasonal maintenance item — replace it at the start of each boating season or whenever water or contamination is visible in the bowl. Having a spare element on board is good practice, especially for extended cruising where fuel quality may be variable.
Common issue: The most frequent ordering error on this product is confusing Sierra 18-7948 (the correct S3227 cross-reference for the 320RRAC01 housing) with Sierra 18-7945, which is a different longer universal Mercury-style element. They are not interchangeable. Always confirm the existing element number and housing series — matching the 1"-14 thread and the 320RRAC01 housing designation is the safest approach. Also confirm whether your housing uses a reusable bowl before ordering, and inspect the bowl O-ring for wear at each filter change.
Related fuel system products: Sierra Marine Fuel/Water Separator Filter 18-7862 • Sierra 18-7919 Fuel/Water Separator Element — 10 Micron • Sierra 18-99201 Clear Replacement Bowl — Racor-Style • Sierra 18-7853-1 Fuel/Water Separator Bracket
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 1-3 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
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If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
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Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
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