10 Best Water Separator Filters 2023 (Reviews, Buyer’s Guide & FAQs)

Written by Tim Rhodes Last Updated: Oct 1 2024

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The water separator filter unit acts as the first line of defense and is vital to keep your engine parts safe, efficient and running at peak performance.

The high-quality fuel water separator guarantees you clean fuel delivery to your engine parts to enhance high performance.

These products offer over 90 per cent efficiency at removing small particles of different sizes even up to 10 microns to maintain the effective fuel flow rate to the engine parts.

The 10-micron size contaminants can cause severe damage to modern fuel pumps and injectors.

The fuel filters, therefore, are approved for use to safeguard your engine and engine parts.

These fuel filter units meet ISO and United States Coast Guard requirements and are Pressure and leak tested to match American Boat and Yacht Council standards.

High-efficiency water separator filters are important and highly recommended to prevent damage to sensitive inboard, stern-drive or outboard fuel injection systems.

10 Best Water Separator Filters Reviewed And Rated

These are the 10 best water separators that will help keep your fuel system in good condition to give you the best experience

1. Quicksilver Water From Fuel Separating Fuel Filter

Quicksilver 802893Q01 is a fuel/water separator for marine equipment designed to enhance smooth running.

This product has high effectiveness in filtering water out due to the high-quality materials used.

This water separator Fuel filter unit is a validated product that guarantees you peace of mind when in the water.

The product placement is very easy and flexible to replace and can be done within a very short time.

These quicksilver fuel filter/water separators are reliable, with the ability to screen out all tiny particles before getting into the engine to safeguard your fuel system.

This Quicksilver filter can be used for inboard and outboards applications.

Quicksilver 802893Q01 removes up to 25-micron contaminants that interfere with fuel efficiency.

This filtering element is designed to meet specifications by the producer of the original mercury marine equipment.

This Quicksilver filter has a thick metallic outer covering with corrosion-resistant paints that enhance protection from weather causing rust.

The fuel/water separator product contains an epoxy interior covering and keeps the fuel clean.

The assembled product dimensions are as follows 24(Length) x 24(Width) x 25.5(Height) inches.

It is recommended for servicing after every one hundred hours of boat operation or once per year.

This water/fuel filter can be used on Mercury, Mariner and Force mercury marine outboards and inboard.

This fuel filter is produced to meet the specifications for mercury marine original equipment to best protect your engine.

Pros & Benefits:

• Corrosion Resistant paints
• Easy and flexible to use
• Flexible placements
• Price is value for money

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2. Moeller 033320-10 10 Micron Water Separating Filter

We can now take care of all water problems in the fuel with this Moeller marine inboard water/fuel filter kit.

Moeller 033330-10 can be used by Mercury, Evinrude, Johnson, Tohatsu, Suzuki, Yamaha Honda and Nissan engines.

This Moeller 10-micron filter’s external covering is black powder-coated with a reusable filter, filter head, barbs and plugs.

This fuel/water separator has its product dimensions as follows, 8.3 (Length) x 5.5 (Width) x 3.88 (Height) inches.

This Moeller product is not recommended to use with electric fuel pumps using in-line fuel filter and also with diesel engines.

The element material for filtration is paper and can filter out the smallest particles up to 10-microns.

It has two inlets and two outlets and a female thread as the outlet attachment.

This fuel filter is made with stainless steel and composite filter heads coated with powder to enhance extreme resistance to corrosion from salty water.

This water/fuel filter with a 10-micron filtration rate can trap the tiny particles and emulsified water from the gasoline oil.

Ensure you have peace of mind in the water with the Moeller water separator fuel filters.

The fuel filter has very high efficiency (3/8 NPT ports offer lower pressure drops) and fixing this product helps in solving problems of the built-in fuel tank.

Pros & Benefits:

• Easy to install
• Work very well
• Extreme resistance to corrosion
• Very reliable
• Reasonable price

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3.

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This Spin-on Yamaha Outboard filter works very well and can help you improve engine efficiency.

This Yamaha fuel/water separator is designed to help you keep your Yamaha Outboard motor from fuel contaminants to give the best experience in boat operation.

It is manufactured by Yamaha with its dimension as, 8 (Length) x 8 (Width) x 8 (Height) Inches and weighs 1.2 Pounds.

This filter for gasoline oil applications has a filtration efficiency of up to 10-microns that is recommended for two-stroke HBDI’s and two-stroke and four-stroke electronic fuel injection (EFI) outboards.

The Electronic Fuel Injection engines have low emissions and no fuel priming is required.

These 10-micron filters from Yamaha are genuine and also work well with carbureted engines.

Yamaha filter MAR-10MEL-00-00 is first in the line of protecting ethanol fuels and has high efficiency of 90 gallons per hour fuel flow rate.

These filters have no battery inclusion and they don’t need one; the item package is just one.

This fuel filter can fit the outboard engine of Yamaha F250 4.2 V6, although there is a need to check your engine specifications.

The package dimension is 6.1 (Length) x 3.66 (With) x3.54 (Height) inches.

The Models of 115 HP may require the MAR MINIF-1L-TR fuel filter.

This fuel filter exceeds or meets the American Boat and Yacht Council; design, maintenance, construction and product performance standards, and also the United State Coast Guard requirements for marine applications.

Pros & Benefits:

• High efficiency
• Efficient filtration
• Easy to use
• Very Reliable

4. Sierra International 18-7989, Fuel Filter

This fuel filter is manufactured by Teleflex marine under the Sierra brand.

This fuel/water separator is very efficient (90 %+) at removing small particles and dirt from your fuel system and no starving of the engine parts for fuel.

These product dimensions are as follows, 3.25 (Length) x 3.25 (Width) x3.5 (Height) Inches and weighs 0.96 ounces and the thread pitch of 13/16-18.

Sierra International’s rated filtration is 10-microns and it’s designed for both diesel and gasoline oil applications.

The manufacturer recommended that you replace your fuel filter preferably winterization; at least once per year or after every 50 hours of operation.

This fuel/water separator is designed to exceed or meet the Original Equipment Manufacturer specifications.

This fuel/water separator filter is coated with epoxy and is made of steel for corrosion resistance to protect your fuel system.

The pressure and leak are tested to meet American Boat and Yacht Council standards and the United States Coast Guard requirements.

The Sierra products are covered under the customers’ satisfaction warranty of the Sierra industry.

This Sierra fuel filter model number is 18-7989, while the Original Equipment manufacturer part number is 3852413.

The fuel/water separator fuel has no folding.

This Sierra international 18-7978 is interchangeable with Volvo Penta 386228 and Jonson/Evinrude outboard 5009676.

Pros & Benefits:

• High efficiency
• Made of the best material
• Very efficient filtration
• High resistance to corrosion
• Easy to fix

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5. Seachoice 20931 Outboard Engine Fuel Water Separating Filter Kit

The Seachoice is committed to ensuring satisfaction in boating and fishing and is loved by all water-sports enthusiasts.

Seachoice 20931 outboard filter kit is made of plastic material and is a high-quality fuel water filter that enhances clean fuel delivery to your engine parts.

These products ensure the removal of very tiny particles and offer filtration efficiency rated up to 10 microns.

This outboard engine fuel filter enables easy replacement due to the spin-on design giving you an easy time and the best experience.

The universal fit for this fuel/water separator filter includes Yamaha, SMI, Suzuki, 12 Sierra, Moeller, Racor, Aqua power, Volvo Penta, filter heads.

The Seachoice 20931 filter is very effective and reliable and has a reusable see-through bowl made of plastic with a drain.

The assembled product dimensions are as follows, 7.75 (Length) x 4.0 (Width) x 4.0 (Height) inches.

These Seachoice outboard engine fuel/water separator kits offer the ability to keep your engine running at high performance and efficiency.

This product is engineered to exceed or meet the American Boat and Yacht Council design, maintenance, construction and product performance standards, and the United State Coast Guards requirements for marine applications.

The manufacturer number for this product is 50-20931 and the model is 20931.

These products offer over 90 % efficiency to maintain an effective fuel flow rate.

This fuel separator filter acts as the first line of defense and is vital to keeping your engine parts safe.

Pros & Benefits:

• Superior product
• Efficient Filtration
• High performance
• Easy to fix

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6. Sierra 18-7946 fuel filter for OMC 502905, 10 Micron

The Sierra 18-7946 fuel filter enhances the removal; of emulsified water from the fuel system up to 99%.

The products offer 90% efficiency at removing small particles rated up to 10 microns size to maintain the fuel flow rate.

The fuel filter is designed to be an exact fit and meet specifications as an OEM canister filter.

These filters are engineered for sterndrives and inboards, along with two-cycle and 4-cycle outboards.

Contaminants of over 10-micron sizes also can cause severe damage with the close tolerance of modern fuel pumps and injectors.

Sierra’s new filtration element delivers ultimate fuel filtration, water separation and maximum fuel flow which fuel-injected engine requires for high performance.

These filters are approved for use with Yamaha HPDI engines.

The Sierra 18-7946 weighs 8 ounces and is designed for use on OMC and VOLVO Penta marine engines.

These filters meet the International Organization for standardization and USCG requirements and Pressure and leak tested to match ABYC standards and USCG requirements.

They are best used for personal crafts, large and small boats.

It is recommended to replace fuel filters preferably at winterization, at least once per year or every 50 hours of operation.

Pros & Benefits:

• Good quality
• Easy to install
• Good performance
• Easy to use
• Very Reliable

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7. New Sierra 18-7945 Fuel Separator Filter 4 pack SIE 7945

This new fuel/water separator removes up to 98.8% of emulsified water from your gasoline oil according to the manufacturer.

The filter is very efficient, over 90% at filtering tiny and contaminant particles up to 10-microns size.

The filter flows 90 gallons per hour to feed even the thirstiest motor.

To prevent damage to the stern drive, sensitive inboard, and outboard fuel injection systems, this new sierra 18-7945 is recommended.

The New Sierra replaces Mercury and MerCruiser 35-604941 and Yamaha ABB-FUELF-1L-TR among other models.

The manufacturer is Boating Accessories under the same brand.

The product dimensions are as follows, 4(Length) x 4 (Width) x 4.5 (Height) inches and the item weighs 1.03 pounds.

The model is a fuel filter water separator with the item model number as 18-7945 and the OEM part number as MERCURY MARINE 35-802893Q.

This filter is designed to meet the high demands of a horsepower engine and can withstand the marine environment that is very harsh.

Sierra guarantees to replace any defective item free of charge.

The 10-micron size particles can cause severe damage to today’s fuel pumps and injectors and therefore, these new sierra filters are approved for use to safeguard your engine parts and grant you the best experience.

Pros & Benefits:

• Durable
• Easy to use
• Efficient filtration
• High results
• High quality

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8. OEM Yamaha Mini-10, 10 Micron Fuel/Separating Filter

The new OEM Yamaha is used on 2-stroke and 4-stroke Yamaha outboards up to and including 115 HP.

This new mini version of Yamaha has a very high output and it is capable to remove small particles; estimated to 10-microns filtration ability.

These OEM Yamaha Mine-10 separating filters are highly recommended for all 2-stroke and 4-stroke EFI outboards and 2-stroke HPDI.

They are a forefront line of defense against all contaminants affecting the ethanol-related fuel systems.

The item is manufactured by Yamaha Marine and the manufacturer part number is MAR-MINIF-1L-TR.

This improved 10-micron fuel/water separator makes available high and effective filtration ahead of the engines’ onboard filters and injectors.

This is not an aftermarket part; it’s a factory original equipment that is genuine and new and the recommended servicing is at least once per year.

The item is designed to exceed the American Boat and Yacht council’s design, maintenance, construction and product performance standards.

The filter is packaged as a single item by the Yamaha brand.

The product dimensions are as follows; 14 (Length) x 12(Width) x 12(Height) inches and weighs 12.8 ounces.

Pros & Benefits:

• Superior filtration
• High results
• Easy replacement
• Good quality
• Cost-effective

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9. QUICKSILVER Water From Fuel Separating Filter

This is a high capacity replacement fuel separating filter for 8M0095669 that has a fuel flow rate per hour of 120 gallons.

To best protect your engine parts this fuel filter is recommended and is designed to meet the manufacturer specifications.

This fuel separating filter can remove even the smallest fuel contaminants up to10 Micron filtration efficiency.

It has a high output of over 90% efficiency removing harmful contaminants, particles and power-robbing water from your fuel between your tank and your engine.

This filter element contains over 25% more capacity than other filters.

The brand is quicksilver and the manufacturer part number is 8M0079962 and is packaged as a single item.

The manufacturer recommended servicing every a hundred hours of boat operation or at least once per year.

The brand name is quicksilver and no batteries are included.

The parcel dimensions are as follows, 23.6(Length) x 11.8(Width) x 10(Height) cm and the item weight is 653 grams.

Pros & Benefits:

• Cost-effective
• Best results
• Resistance to corrosion
• Efficient filtration
• Easy to fix

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10. DIESEL FUEL FILTER/WATER SEPARATOR FOR R12T MARINE SPIN-ON HOUSING 120AT

These filters are produced for applications with high output and with a flow rate of 30 gallons per hour on the R12T model.

This helps your engine parts to perform better than ever with clean, water-free fuel.

Fuel water separating filters can fit 3/8 inch NPT motors also with a maximum flow rate 30 gallons per hour or (7 LPH).

The spin-on filter design is simple to replace and has a reusable bowl.

The fuel filter is not yet discontinued by the manufacturer and its manufacturer part number is Z135-WS.

This product’s package dimensions 6.65x 4.06x 3.46 inches and it weighs 1.27 pounds.

The manufacturer of this diesel fuel/water separator is CARMOCAR.

The filter is over 90% efficient at removing particles as small as 0 microns.

The 0-micron filters are recommended to prevent damage to sensitive inboard, stern-drive and outboard fuel injection systems, designed to trap the smallest particles and the emulsified water from diesel.

Tighten the valve, the water will not discharge.

Release the valve, the water can be free to discharge.

These are more suited for compact off-road diesel equipment.

Pros & Benefits:

• Easy to plumb
• One year warranty
• Self-venting drain
• Very efficient filtration
• Cost-effective

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How Does A Fuel Separator Work?

A fuel separator filter ensures that clean fuel is reaching the engine.

It filters the fuel, whether it is petrol, diesel, gasoline, or water and other contaminants before the fuel reaches the engine parts.

The fuel water separator has a small filter that stops tiny droplets of water from passing through the pipes towards the engine.

This water and other contaminants are then collected and let out through other outlets.

Fuel filtration is very important for the smooth running and long term functioning life of the engine and engine parts.

The small price to be paid for the fuel filter will save from the huge price that you may have to pay for repairs of the costly engine.

Final Thoughts

There are tons of fuel/water separating filters; it all depends on the type of fuel system you are using.

The 10-micron size contaminants are dangerous to modern fuel pumps and injectors and therefore, these filters are approved for use to safeguard your engine parts and give you the best marine experience.

What kind of fuel is your marine equipment using; Diesel, gasoline, or any ethanol-related fuel system?

Do you wish to keep your fuel system safe?

A water separator fuel filter is important to keep your engine and engine parts safe, efficient and running at peak performance.

These 10 fuel filters are high quality, cost-effective, easy to use and replace, and very efficient for high performance and enhancing safe fuel systems.

These water separator filters are designed to meet the manufacturer specifications for mercury marine original equipment to best protect your engine parts, always.

Let us know in the comment if there are any filters that should be in this list and are missing.