AULDAY S3213 Marine Fuel Filter & Water Separator with Clear Bowl — Single Unit, 3-Layer Synthetic Media

The AULDAY S3213 is a direct-fit marine fuel filter and water separator with a clear bowl designed to remove water and contaminants from outboard fuel systems.

Keep your boat's engine running smoothly by installing a reliable in-line fuel filter that separates water and traps debris before fuel reaches the pump and injectors. The S3213 replaces multiple OEM part numbers and uses a three-layer synthetic media to capture particles while letting you visually inspect the bowl for water accumulation. It comes as a single unit for easy swap-out and requires no electrical changes—just simple mechanical installation.

How does the S3213 protect my outboard motor?

The S3213 intercepts water droplets and solid contaminants that can damage fuel pumps, injectors, and engine surfaces. Its multi-layer filter media traps particulate while the clear bowl lets you see and drain separated water before it compromises performance.

• Three-layer synthetic filter media captures fine particles and sludge.
• Clear collection bowl shows water build-up for timely draining.
• Improves fuel delivery consistency and reduces wear on engine parts.

Will this fit my existing marine fuel system and which OEMs does it replace?

The S3213 is built as a plug-and-play replacement for a variety of marine filter part numbers, so it fits many outboard applications without modification. Check your current filter’s OEM number against the listed cross-references to confirm fitment.

• Direct replacement for numbers such as 35-60494-1, 18-7932-1, 35-809097 and more.
• Designed for marine outboard fuel systems—no electrical changes needed.
• Simple mechanical installation using existing fuel lines and mounts.

How do I install and maintain the filter for best performance?

Installation is straightforward: remove the old filter, fit the S3213 into the fuel line, pre-fill the dirty-side chamber with clean fuel, prime the system, and check for leaks. Regularly inspect and drain the bowl and replace the filter according to engine maker recommendations or when visible contamination appears.

• Pre-fill the dirty side with clean fuel before starting to avoid air entry.
• Prime the fuel system after installing and run the engine briefly to check for leaks.
• Do not reuse old filter elements—replace the whole unit when servicing.

What materials and warranty back this product?

The element uses an Italian-made, three-layer synthetic fiber media engineered to trap contaminants while resisting moisture. The assembly is intended for demanding marine environments and is backed by a limited shop warranty and technical support for peace of mind.

• Original three-layer synthetic filter paper for high-efficiency separation.
• Clear, serviceable bowl for visual monitoring and water drain checks.
• 12-month warranty from the seller plus lifetime technical assistance.

Who is this for: The AULDAY S3213 is aimed at boat owners, marine technicians, and fleet managers who need a dependable, easy-to-install fuel filter and water separator for outboard engines. It's well suited for people replacing worn or clogged filters with a direct-fit unit that offers visible water monitoring and uses durable filter media for improved engine protection.