Mercury Outboard Filters & Strainers

Mercury Marine Engine Filters and Strainers Resources and Information

PartsVu.com is happy to offer a wide selection of certified Mercury marine engine filters and strainers to match the exact specifications of your Mercury outboard motor. If you need assistance servicing your Mercury outboard’s fuel or oil system, follow along with these helpful guides over on our blog: Mercury fuel system 100-hour service, Mercury 4-stroke oil change - 100-hour service.

Browse the rest of our complete selection of Mercury outboard parts, or shop our list of fuel filter categories, including: 

• Mercury Outboard Fuel Filters
• Mercury Outboard Oil Filters

Mercury Outboard Filters and Strainers FAQs

How do I change my Mercury outboard fuel filter?

It’s necessary to replace the in-line fuel filter on your Mercury outboard engine every 100 hours. Before changing your Mercury outboard fuel filter, you’ll first need a replacement fuel filter and some paper towels on stand-by. The fuel filter is located inside the motor on the starboard side. Notice that there is an arrow on the filter, indicating the direction in which the filter should go on. Disconnect the bottom from the fuel filter. Use the paper towels to catch any drippage. Following the arrows, insert the replacement fuel filter. Detach the handle from the old filter and dispose of the spent filter. Attach the handle to the new fuel filter. Secure the top portion to make sure the hand is attached. Finally slide the filter back into the hole inside the engine.

How do I service my Mercury 4-stroke outboard fuel system?

Use a filter wrench to loosen the existing filter element and use caution when removing it as it will be filled with gasoline. A clear plastic or glass container is helpful to dump the filter and examine the contents. A small amount of debris is common, as is a small amount of water after the fuel has had a moment to settle. More significant amounts of water would warrant further investigation.

Move back to the engine and locate the filter element(s) on the engine. The scope of this service will only include the low-pressure fuel filter and fuel water separator if applicable by model. Mercury recommends that owners do not service their high-pressure fuel filters. Depending on your engine model, the water separator filter (or castle filter) may be removed by using a wrench, standard tools, and a little caution. Unplug the water-in-fuel sensor if applicable and spin the cap off of the housing. Replace the filter element with a fresh one, lube the o-ring with grease or oil, and carefully reinstall the cap.

Locate your Mercury engine’s primer bulb if applicable and use the primer to pump up the fuel system. You should feel and hear gasoline entering and filling the filter cup. Check for leaks and prime until the bulb becomes firm.

If you are not already regularly running Mercury Quickare and/or Quickleen through your Mercury fuel system, the 100-hour service interval is an excellent time for a “shock treatment.” Quickare is a fuel system cleaner and top-lube that will help to clean deposits from the tank, lines, carburetors, injectors, and pumps. It breaks up fuel system varnish and will help to prevent gumming.

Quickleen is a fuel system conditioner that also helps to remove carbon deposits. The standard dose is one ounce per ten gallons, but if you are not running the product regularly, you can double that ratio for more cleaning power. Pour the products into the fuel tank fill and run the boat. No additional work is needed. It is a great idea to inspect your fuel tank fill’s o-ring for damage when you add fuel or additives as a damaged o-ring can allow water from rain or boat washing into your fuel system.

How do I perform an oil change on my Mercury 2-stroke outboard motor?

Engine oil selection is critical to long life, so review the information in your owner’s manual to make certain you are using the correct products. Not all TCW3 oils are formulated the same, and different Mercury models do prefer specific oils. Mercury Marine offers a wide assortment of engine oil – both in blend and additives. If you are uncertain exactly which oil is best for your application, consult your owner’s manual.

If you do locate contamination in the oil tank, use a vacuum extractor to pull the remaining oil out of the tank for proper disposal. While good quality two-stroke oil is certainly expensive, running contaminated oil can lead to catastrophic failure. If you have never cleaned the bottom of your tank, prepare to be surprised by what you find.

Several laboratories provide performance testing of used oils, allowing you to learn more about the health of your engine. Blackstone Labs is one such provider, and they have a convenient mail-in kit that includes everything you need to submit an oil sample. They can also test gear oils, hydraulic fluids, and oils from your other vehicles or toys. Oil test results can tip you off to an accelerated wear condition inside of your engine long before any other symptoms show up. If you still want to know more about your engine, purchase an oil filter cutter and open the spent filter to look for evidence of contamination and metal dust or shavings.

How do I change my Mercury 4-stroke outboard engine oil?

As the old oil is draining, you can work on removing the engine oil filter. Depending on your specific Mercury model, your filter may have a drain lip that helps to keep the mess to a minimum when you unscrew the old filter. However, most older engines do not have this feature. We suggest being prepared with plenty of absorbent rags or placing a small cup that is cut to size below the filter before removal. Using a PartsVu Maintenance Essentials filter wrench is the best way to loosen the filter. Remember when you reinstall the filter, over-tightening will only make your life more difficult when you are ready for the next service. Some technicians puncture the old filter allowing trapped oil to drain back into the block before removal, but this will ruin your ability to take the filter apart for further inspection.

Several laboratories provide performance testing of used oils, allowing you to learn more about the health of your engine. Blackstone Labs is one such provider, and they have a convenient mail-in kit that includes everything you need to submit an oil sample. They can also test gear oils, hydraulic fluids, and oils from your other vehicles or toys. Oil test results can tip you off to an accelerated wear condition inside of your engine long before any other symptoms show up. If you still want to know more about your engine, purchase an oil filter cutter and open the spent filter to look for evidence of contamination and metal dust or shavings.

Once you have inspected your spent oil and filter, set them aside for proper disposal. If you removed the drain screw to empty your oil, carefully reinstall the drain plug. The new oil filter should be removed from its package and the o-ring lubricated with a thin coat of fresh engine oil. Spin on the new oil filter and gently tighten to seat the o-ring without over-torquing.

Mercury Marine offers a wide assortment of engine oil – both in blend and viscosity. If you are uncertain as to which oil is best for your application, consult your owners’ manual. Loosen the yellow oil fill plug on the top of the engine and pour in fresh oil. We recommend adding slightly less than the stated capacity. With the engine trimmed down, check the oil level on the dipstick after allowing a few minutes for the oil to drain into the oil pan properly. Filling the oil to the lower level on the dipstick will help you to measure if the oil level changes over time with the engine in operation.

Why should I use Mercury fuel additives?

Quickare treats and stabilizes fuel at every fill-up which is necessary because just about all gasoline today contains up to 10% ethanol. Left untreated, ethanol-blended fuel can break down leading to gum and varnish build-up which causes internal engine corrosion. Fuel additives such as a bottle of Quickare keep fuel fresh between fill-ups for up to three months.

The second step within Mercury’s fuel care system cleans your engine and fuel system. All combustion motors develop carbon deposits and the best way to clean those deposits is to add Mercury Quickleen to your fuel tank. Simply add a bottle of Quickleen to your outboard fuel tank once per year to remove carbon deposits, prevent engine knocking, piston seize up, and extend spark plug life. Aggressive fuel system cleaner within Quickleen works to quickly and thoroughly remove carbon deposits from carburetors and fuel injectors, intake valves, spark plugs, piston crowns, and cylinder heads.


Likely, there are periods when your boat is stored or is used infrequently, which can lead to issues with your engine running. If your boat will be sitting for an extended period of time, you need to add a fuel stabilizer like Mercury Marine Quikstor to prevent both regular and ethanol-blended fuels from breaking down, oxidizing, and causing fuel system corrosion, and eventually affecting the engine’s performance. Before storage add a bottle of Quickstor to your fuel tank, then run the engine so that the treated fuel circulates throughout the engine and fuel lines. This extended fuel stabilizer prevents gum and varnish from forming in the engine, fuel lines, and tank and stabilizes fuel for up to one year, thereby successfully averting any fuel-related problems. One ounce of Quickstor treats five gallons of fuel, so a 12-ounce bottle treats 60 gallons.

Are there any other Mercury marine fuel filters besides Mercury inline fuel filters?

Yes, besides Mercury inline fuel filters, there are other types of fuel filters available for Mercury marine applications. Here are a few examples:

1. Mercury High-Capacity Fuel Filters: These are larger-sized fuel filters designed to handle higher flow rates and provide increased fuel filtration capacity. They are commonly used in high-performance Mercury outboard engines or applications that demand greater fuel filtration capabilities.
2. Mercury Fuel/Water Separators: Fuel/water separators are specialized filters designed to remove both fuel impurities and water from the fuel system. They help protect the engine from water contamination, which can cause performance issues or damage. Mercury offers fuel/water separators for various engine sizes and fuel system setups.
3. Mercury In-Tank Fuel Filters: Some Mercury marine engines may feature in-tank fuel filters, which are located inside the fuel tank. These filters are typically integrated into the fuel pump assembly or connected to the fuel pickup. They serve to filter out larger particles and debris before the fuel is drawn into the engine.

It's important to consult your Mercury engine's manual or contact a Mercury authorized dealer to determine the specific type and model of fuel filter recommended for your particular engine. They can provide accurate information on the compatible fuel filter options and guide you in selecting the most suitable filter for your Mercury marine application.

Where can I learn more about Mercury outboard parts?

PartsVu understands that boaters want to learn how to perform their own Mercury outboard maintenance. From maintaining your Mercury outboard, Mercury sterndrive, and MerCruiser engines, there’s always something new to learn and save money. That’s why PartsVu offers our comprehensive blog, The Partsvu Xchange. 

Read up on the latest developments in boating, as well as search for everything you need to know about Mercury outboard maintenance.

To get you off to a good start, these are some of the most important articles on Mercury Filters, Mercury Strainers, and more:

• What Are Good Safety Precautions When Fueling Your ...
• Mercury Fuel System – 4-Stroke 100-Hour Service
• Mercruiser Oil Change In 8 Easy Steps
• How To Protect Your Mercury Outboard

What are Mercury filters and strainers?

Mercury filters and strainers are components used in Mercury outboard engines to filter out impurities and debris from fuel and water to ensure the engine runs smoothly.

How often should I replace the fuel filter on my Mercury outboard engine?

It is recommended to replace the fuel filter every 100 hours of engine operation or annually, whichever comes first.

Can I clean and reuse my Mercury fuel filter?

No, it is not recommended to clean and reuse fuel filters. It is better to replace the filter to ensure optimal engine performance.

How do I know if my Mercury fuel filter needs to be replaced?

If you notice reduced engine performance or a loss of power, it could be a sign that your fuel filter needs to be replaced. It is also important to replace the filter according to the recommended maintenance schedule.

What are the benefits of using Mercury strainers?

Mercury strainers help prevent debris and other foreign objects from entering the engine cooling system, which can cause damage and reduce engine performance. Using strainers can help extend the life of your engine.

How often should I check and clean my Mercury strainer?

It is recommended to check and clean the strainer at least once a month or more frequently if you are operating in areas with high debris or seaweed.

Can I use non-Mercury filters and strainers on my Mercury outboard engine?

While it is possible to use non-Mercury filters and strainers, it is always best to use genuine Mercury parts to ensure optimal engine performance and prevent any potential damage or issues.

What is the purpose of Mercury filters and strainers?

Mercury filters and strainers are designed to prevent debris and contaminants from entering and damaging the engine.

Are Mercury filters and strainers manufactured to OEM specifications?

Yes, Mercury filters and strainers are manufactured to meet or exceed OEM specifications to ensure proper fit and function.

Can using Mercury filters and strainers decrease the quantity of pollutants in the environment?

Yes, using Mercury filters and strainers can help prevent engine damage and reduce the amount of pollutants that are released into the environment.

Where can I find replacement Mercury filters and strainers?

Replacement Mercury filters and strainers can be found at authorized Mercury marine dealerships, as well as through online retailers that specialize in boating and marine parts.

What are Mercury 150 optimax fuel filters?

Mercury 150 OptiMax fuel filters are an integral part of the fuel system in Mercury 150 OptiMax outboard engines. These fuel filters are designed to remove impurities and contaminants from the fuel before it reaches the engine, ensuring clean fuel supply for optimal performance and longevity of the engine.

The Mercury 150 OptiMax fuel filter is typically located between the fuel tank and the engine. It is responsible for filtering out particles, debris, and water that may be present in the fuel. This helps prevent clogging of fuel injectors, fuel system damage, and engine misfires, ensuring smooth and reliable operation.

Do Mercury outboards have air filters?

No, Mercury outboard engines do not typically have traditional air filters like those found in automotive engines. Instead, they utilize a different type of air intake system that does not require a separate air filter.

Mercury outboard engines are designed to draw air from the surrounding environment directly into the engine cowling. The cowling incorporates various air vents and openings strategically positioned to allow sufficient airflow while preventing water and debris from entering the engine. These design features effectively filter out larger particles and contaminants, ensuring that only clean air reaches the engine's combustion chambers.

However, it's important to note that while Mercury outboards do not have replaceable air filters, it is still crucial to keep the engine's air intake system clean and free from obstructions. Regular maintenance, such as cleaning the cowling and removing any debris or buildup, is recommended to ensure proper airflow and prevent any potential issues that could arise from restricted air intake.

Can I use Yamaha fuel filters for Mercury outboard and MerCruiser engines?

It is generally recommended to use genuine Mercury or MerCruiser fuel filters specifically designed for your Mercury outboard or MerCruiser engine. While there may be some similarities in fuel filter sizes and specifications between different brands, it is best to use the recommended filters for your specific engine model.

Each engine manufacturer designs their fuel filters to meet the unique requirements and performance specifications of their engines. Using filters from a different brand, such as Yamaha fuel filters on a Mercury or MerCruiser engine, may not provide the optimal filtration and flow characteristics required for proper engine performance.

Using the correct fuel filters designed for your Mercury outboard or MerCruiser engine ensures that they are compatible with the engine's fuel system, maintain the proper fuel flow, and effectively filter out impurities and contaminants from the fuel. It also helps in preserving your engine's warranty coverage.

What info can I learn from a Mercury outboard fuel filter chart?

A Mercury outboard fuel filter chart provides valuable information regarding the fuel filters used in Mercury outboard engines. It typically includes details such as filter part numbers, compatibility with specific engine models, recommended service intervals, and additional notes or instructions related to the fuel filters.

Here are some key pieces of information that you can learn from a Mercury outboard fuel filter chart:

1. Filter Part Numbers: The chart will list the various fuel filter part numbers available for different Mercury outboard engine models. This allows you to identify the correct filter for your specific engine based on the part number.
2. Engine Compatibility: The chart will indicate which engines each fuel filter is compatible with. This information helps ensure that you select the appropriate filter for your engine model to maintain optimal performance and compatibility.
3. Service Intervals: The fuel filter chart may include recommended service intervals for replacing the filters. This information guides you on when to inspect and replace the filters to ensure proper fuel filtration and prevent potential issues related to clogged or dirty filters.
4. Additional Notes: The chart may contain additional notes or instructions related to the fuel filters. These can include information about any special considerations or procedures for installing, maintaining, or replacing the filters.

By consulting a Mercury outboard fuel filter chart, you can easily identify the correct fuel filter for your engine model, understand the recommended service intervals, and ensure proper maintenance of the fuel system for optimal performance and longevity of your Mercury outboard engine.

How many fuel filters on 2013 Mercury 115hp outboard?

The 2013 Mercury 115hp outboard engine typically has two fuel filters. One is the primary fuel filter, often referred to as the "in-line" fuel filter, which is located between the fuel tank and the engine. The primary fuel filter is responsible for filtering out larger particles and contaminants from the fuel before it reaches the engine.

The second fuel filter is the "water-separating" fuel filter, also known as the "fuel/water separator." This filter is designed to remove water and additional impurities from the fuel, ensuring clean and dry fuel reaches the engine. The water-separating fuel filter is typically located near the engine, closer to the fuel line connections.

Do Mercury engine oil filters work as well for high-viscocity marine oils as they do for low-viscocity marine oils?

Yes, Mercury oil filters are designed to work effectively with both high-viscosity and low-viscosity marine oils. The primary purpose of an oil filter is to remove contaminants and impurities from the engine oil, regardless of its viscosity.

Marine oil filters, including those manufactured by Mercury, are engineered to meet specific filtration requirements and ensure the proper flow of oil throughout the engine. They are designed to capture and trap particles such as dirt, metal debris, and contaminants, regardless of the viscosity of the oil being used.

Whether you are using a high-viscosity marine oil, such as SAE 40 or SAE 50, or a low-viscosity marine oil, such as SAE 10W-30 or SAE 5W-30, a properly installed and functioning Mercury oil filter will effectively remove impurities and protect your engine from potential damage.

Should I trust amazon Mercury outboard oil filters versus those sold by PartsVu?

When it comes to choosing between Mercury outboard oil filters sold on Amazon and those sold by PartsVu, it's important to consider a few factors to make an informed decision.

1. Authenticity and Quality: It's crucial to ensure that the oil filter you purchase is genuine and of high quality. Amazon is a marketplace with various sellers, and while many offer legitimate products, there is also the possibility of counterfeit or low-quality items. PartsVu, on the other hand, is a reputable marine parts retailer known for supplying genuine and reliable products.
2. Warranty and Customer Support: If you encounter any issues with the oil filter or have questions regarding its installation or compatibility, it's beneficial to have access to reliable customer support. PartsVu typically provides dedicated customer service and assistance with their products, ensuring a smooth purchasing experience and reliable support.
3. Product Selection and Fitment: PartsVu specializes in marine parts and accessories, including Mercury outboard oil filters. They often offer a wide range of options specifically curated for marine applications, ensuring a proper fit and compatibility with your Mercury outboard engine. While Amazon may have a vast selection, it's important to carefully check product details, customer reviews, and seller reputation to ensure you are selecting the correct filter.
4. Pricing and Shipping: Pricing can vary between different platforms and sellers. It's essential to compare prices between Amazon and PartsVu to determine which offers the best value for your specific oil filter needs. Additionally, consider shipping options, delivery times, and any associated costs to make a well-informed decision.

Ultimately, the trustworthiness and reliability of an oil filter depend on the seller and the product's authenticity. If you are confident in the seller's reputation and their commitment to providing genuine products, purchasing from Amazon may be a viable option. However, if you prefer the convenience of a dedicated marine parts retailer with a focus on customer satisfaction and reliable support, PartsVu is the reliable choice.

Are Mercury fuel filters interchangeable with Mercury outboard oil filters?

No, Mercury fuel filters are not interchangeable with Mercury outboard oil filters. Fuel filters and oil filters are designed for different purposes and have distinct characteristics that make them suitable for their respective applications.

Fuel filters are specifically designed to filter and remove impurities, contaminants, and water from the fuel before it reaches the engine. They are typically located in the fuel line or within the fuel system of the outboard engine.

On the other hand, oil filters are designed to filter and remove impurities and particles from the engine oil. They are typically located near the engine and are responsible for capturing contaminants and preventing them from circulating through the engine, helping to maintain clean and efficient oil.

While both fuel fi