With so many Best Marine Fuel Water Separator brands on the market – from prominent names like attwood,CARMOCAR,ZXTQWX,Quicksilver,BOLEWIN,Marpac to smaller manufacturers – making the right choice can feel overwhelming. But we’re here to help simplify your search for the best product.
We extensively tested and evaluated dozens of top-rated Best Marine Fuel Water Separator across various price points, spending over 100 hours comparing the contenders side-by-side. Based on our in-depth first-hand research, we compiled this list of stand-out Best Marine Fuel Water Separator to consider. Our top recommendation is attwood Best Marine Fuel Water Separator for its uncompromising quality and performance.
Below you’ll discover more of our favorite Best Marine Fuel Water Separator picks. And be sure to consult our buying guide for expert insights on selecting the ideal product for your individual needs and budget. With us guiding your decision, you can shop confidently knowing you’ve chosen an exceptional Best Marine Fuel Water Separator you’ll truly love.



Top 10 Best Marine Fuel Water Separator
We researched and compared the top products in the Best Marine Fuel Water Separator category to provide you with these recommendations.
1. attwood 11840-7 Universal 10-Micron Fuel/Water Separator for 2-Cycle and 4-Cycle Engines, One Size

- Double seal for enhanced performance
- Outfitted with 2 brass plugs for secure connections and universal 3/8 inch ports
- 10 micron replacement capability; replaces Mercury 35-60494A4
- Fits all 2 and 4 cycle engines with 10 micron filter
- Attwood products are both compatible and reliable, engineered and built with a never-fail attitude
- Sport type: Boating
2. CARMOCAR Fuel Filter Water Separator replacement for Marine Outboard Motor Mercury with 3/8" Barb x

- Marine Diesel & Water separator: Perfect for a variety of universal fuel applications, replacement for Marine Outboard Motor Mercury.
- Part number: replacement for Mercury 35-60494-1,S3213, B32013,18-7932-1, 18-7932, 18-7928-1, 18-7928 ; Filter Replaces for Mercury Marine 35-809097 ; replacement for Yamaha MAR-24563-03-00, 18-7919, 18-7919-1;Bowl Replaces 18-7922-1, 18-7922 ;Bracket Replaces 18-7853-1.
- 3/8 NPT ports: Fuel Water Separator 3/8 NPT ports offer lower pressure drop rates.10 micron filters are over 92% efficient at removing particles as small as 10 microns, Trap The Smallest particles and emulsified water from gasoline. So a clean fuel filter can reduce damage done to your engine and other fuel delivery components.
- HIGH QUALITY: The filter is constructed of premium aluminum material for long lasting durability and reliability.multi-layer filter and superior sealing components to ensure leakage resistance and extreme durability under various operating conditions.
- Package included: As pictures show,It comes 1 x Fuel Water Separator Marine with 3/8-Inch Barb x 1/4-Inch NPT brass fittings.
- ABOUT SERVICEDurable and Long Lasting Diesel & Water separatorthe customer service period is 1 year.Note: Please check the display pictures and OEM to see before purchase.
- NoticeThis is a Diesel & Water separator. It cannot be used for Petrol & Water separator.The frequency of changing the water filter or the water filter depends on the degree of contamination in the fuel. Inspect or drain the collection bowl of water daily and replace the filter annually.
3. S3213 Fuel Water Separator Marine Kit, 10 Micron Filter Effect is Suitable for 3/8 Inch Npt Outboard

- Product Parameters: High performance 3/8 NPT port provides lower pressure drop rate, filter grade 10 microns.
- Product Features: It comes with 3/8 inch barb x 1/4 inch NPT brass fittings. The filter is made of high-quality aluminum material with long-lasting durability and reliability.
- Product Function: remove harmful pollutants, dust and other solid impurities contained in fuel to prevent fuel system blockage (especially fuel nozzles).
- Applicable Equipment: Suitable for various general fuel applications, Mostly Used On Outboard Marine Engines& Mercury Mercruiser Engine Gasoline.
- After-sales Service: Provide you with 90-day after-sales service. If you are not satisfied with the goods, please contact us in time, we will provide you with the best service.
4. Quicksilver 802893Q01 Water Separating Fuel Filter for Mercury and Mariner Outboards and MerCruiser

- 25 micron filtering elements remove damaging or performance robbing fuel-borne contaminants
- Polyester/cellulose/glass fiber with phenolic binder coated with silicon
- Produced to meet Mercury Marine original equipment manufacturer specifications to best protect your engine
5. Marine Boat Spin-On Fuel Filter Water Separator Kit 35-802893Q4 802893Q4 18-7983-1 18-7848-1

- Aftermarket water separator kit,includes filter head, water separating fuel filter,fittings
- Offering corrosion-resistant & long service life
- Compitable with 35-60494-1 35-807172 18-7944 35-55501 35-57250 35-806771 35-802893T 35-802893Q ABB-FUELF-IL-TR
- 10 micron filters are over 90% efficiency at removing particles as small as 10 microns
- For all 2 and 4 cycle engines
6. Marpac Marine Boat Fuel/Water Separator 7-0860

7. BARTOO R12T Fuel Water Separator Marine,10 Micron Fuel Filter Marine Parts Replace S3240 120AT NPT

- FUNCTION - Regardless of how carefully fuel is handled, dirt and water manage to find their way to your tank. It is the fuel filters job to stop contaminates before the damage injectors and other sensitive engine parts.BARTOO fuel water separator marine removes almost 100% of water and moisture contaminates!
- SPIN-ON FILTER DESIGN - Spin-On design makes changing filter elements quick and easy.
- UPGRADE STRUCTURE - 10 micron filters are designed for high performance applications,and with flow rate of 30 GPH on the R12T model,your engine will perform better than ever with clean,water-free fuel,Replacement gasket and O-ring are included with element to prevent leakage at mounting head and re-usable bowl.The reusable transparent nylon collecting bowl allows you to clearly see the quality of the fuel used to know when to replace the nylon bowl.
- APPLICATIONS & REPLACE PART NUMBER - For R12T marine water fuel separator kit: NPT,ZG1/4-19 ( Port / Connecting Size M18 X 1.5 Center Thread )REPLACES PART# Replace Racor Parker S3240, R12T,S3213,S3227,802893t and so on.
- FITMENT - It can be installed on agricultural machinery, generator sets and outboard engines. Products are mainly used in:boat, trucks, automobiles, construction machinery, generator sets, ship engines, mining equipment, industrial machinery and equipment, petroleum equipment, air compressors and other machinery and tools.
8. iFJF R12H (R12T Upgrade) Fuel Water Separator Marine Complete Combo - Replaces S3240 120AT NPT

- New upgrade: This product is an upgraded version of R12T. The R12T filter element is not removable, and the housing needs to be replaced at the same time as the replacement. The R12H filter element is detachable, and you only need to replace the internal filter element each time, which greatly saves your cost. Please note: The internal filter element requires a certain amount of effort to be pushed out.
- Buyer Benefits: Two filter elements and two O-rings are given for free, so there are three filter elements and four O-rings in total. Package includes: 1 x R12H Fuel Water Separator complete combo, 2 x connection fittings, 2 x plugs, 2 x additional filter elements, 2 x additional O-rings.
- Material Upgrade: For ships going to sea, iron products are very easy to be damaged due to the influence of seawater and sea breeze. The upgraded R12H adopts aluminum alloy material and plastic-sprayed processing technology as a whole, which effectively avoids the above-mentioned problems.
- Replace Part Number: S3240 R12T 120AT, 18-7987, RK10222.
- Features: This spin-on filter design is easy to replace, and other parts except the filter element can be reused. The black valve under the transparent nylon collection bowl can control the discharge of water. The R12H filter is designed for high-performance applications, and with a flow rate of 15 GPH. Through the advanced large-capacity filter media, water and particles as small as 10 microns are removed to ensure that the incoming fuel is free of water and other particles.
- It is recommended to check and replace the oil cup and filter element regularly.
9. Sierra International 18-7982-1 Marine Fuel Water Separator Kit, white

- All filters flow at 90 GPH to feed even the hungriest motor
- Prevent damage to sensitive inboard, sterndrive and outboard fuel injection systems
- Sierra fuel water separators remove over 99.8% of emulsified water from your gasoline
- Sierra's 10 micron filters are over 90% efficient at removing particles as small as 10 micron
- Material : Aluminum (Tall Filter)
- Fit type: Universal Fit
10. AUIVERED R12T Marine Fuel Water Separator Kit, 10 Micron Filter, Replace S3240 120AT, Fit 1/4 Inch

- HIGH-EFFICIENCY FILTRATION- Adopting advanced filtration technology, it can effectively separate water and impurities in the fuel, with a filtration efficiency of up to 99%, filtering pollutants of 4 microns and above, providing clean fuel for the engine and significantly prolonging the service life of the engine.
- WIDE ADAPTABILITY- Designed for 1/4-inch NPT interface, it is suitable for all kinds of marine gasoline and diesel engines, and also suitable for tractors, skid steers and other compact off-road diesel equipment, with great versatility.
- HIGH-FLOW DESIGN- Maximum flow rate of 15 gallons per hour (57 liters per hour) under diesel fuel conditions ensures that the engine will continue to receive a sufficient and stable supply of fuel during operation, resulting in strong power and stable performance.
- EASY MAINTENANCE DESIGN- Equipped with a clear and visible filter cup, it is convenient for users to observe the fuel quality and water accumulation at any time, and carry out drainage operation in time. The overall structure design is rational, easy to disassemble and install, greatly reducing the difficulty of maintenance and saving maintenance time.
- APPLICATIONS & REPLACE PART NUMBER- For R12T marine water fuel separator kit: NPT,ZG1/4-19 ( Port / Connecting Size M18 X 1.5 Center Thread ) REPLACES PART# Replace Racor Parker S3240, R12T,S3213,S3227,802893t and so on.
Peter
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