Yamaha Outboard VST Fuel Filters & Gaskets

Yamaha Marine Engine VST Fuel Filters and Gaskets Resources and Information 

Yamaha outboard engines have a Vapor Separator Tank (VST) attached to the electric fuel pump. The VST filters gas again just before it’s pressurized into the fuel injection rail(s). The VST is a prime spot in your fuel system where deposits and gum can form, particularly if fuel is untreated, and the VST filter is the most difficult to access and usually the most expensive to replace.With this in mind, regularly replacing VST filters is essential for maintaining your Yamaha outboard fuel system. 

PartsVu.com stocks a complete selection of certified Yamaha VST fuel filters and gaskets to match the exact specifications of your Yamaha outboard motor. Plus, PartsVu stocks a wide selection of Yamaha outboard parts to service your Yamaha outboard. 

Need help servicing your Yamaha outboard engine? We publish a variety of helpful resources, like our Yamaha Outboard Service Schedule.We also regularly release new helpful resources like: 

• Yamaha Outboard Maintenance Parts Charts

• Yamaha Outboard Specs & Capacities Chart

• Yamaha Outboard Engine Schematics

Yamaha Outboard VST Fuel Filters and Gaskets FAQs

What are common Yamaha outboard fuel system issues?

One of the most common ways your Yamaha outboard motor will break down is a fuel system failure. Whether you’re experiencing an intermittent bog down, poor performance, or complete engine failure, your fuel system is a common culprit.

• Ethanol gasoline: Only use premium low-ethanol gasoline for your Yamaha outboard motor. The reason is that ethanol attracts water, causing fuel to dilute through “phase separation.” Additionally, ethanol gasoline can also gunk up fuel lines and fuel system components due to additives used. To help prevent these issues, regularly use a high-quality fuel stabilizer.

• Fuel lines: Check your Yamaha fuel lines. If you discover any breaks or leaks, you should stop using the engine and make any necessary replacements. Also, take a look at any fuel hoses with an interior liner.

• Fuel filters: The fuel filter on your Yamaha outboard is designed to catch any debris and contaminants that have entered your fuel system. Regularly replace your fuel filters to keep fuel running freely.

• Fuel pump: A malfunctioning fuel pump can significantly reduce engine performance and, over time, severely damage other components. If your fuel pump is not working correctly, replace it and any hoses that may have been affected.

Why are there so many Yamaha outboard filters?

It’s no secret that Yamaha fuel filters are necessary for outboard engines to perform properly in the harsh marine environments they regularly encounter. But the question remains, why are there so many Yamaha outboard fuel filter replacement options?

The answer is simple yet complex. All dirt is not created equally – dirt appears in various forms and sizes. Some dirt particles are larger pieces, and some are minute dust particles. Some material you can easily see, other material can be microscopic biological growth and may still be growing.

Dirt takes different forms. It may be shaped like a ball or more like an arrow. The ball type usually gets caught easily, but the arrow type may penetrate the first and second two in line filter and get stuck in the third. Once the arrow lays across the filtering medium, it partially closes the passage holes and makes them smaller, capturing even smaller debris. The clogging will then continue. If the initial filter really becomes restricted, the vacuum on the filter may suck the debris through it and on to the next filter, and so on.

Poor fuel quality, water, ethanol, lack of fuel rotation, and biological growth all add up to clogged filters. This is why it’s essential to change all Yamaha fuel filters on a regular basis based on factory guideline recommendations. Always be sure to refer to the specific engine’s service manual for more information on recommended service intervals and the location of filters.

Some Yamaha four-stroke outboard engines require several of the fuel filters below or screens to help prevent water and debris from getting inside the engine.

What is 10-micron fuel-water separating filter?

This filter helps separate water from fuel and also helps keep debris out. It is recommended to change this filter every 50 hours. We also recommend carrying a spare fuel-water separating filter on board in case you get a tank of bad gas, and the filter is overwhelmed. Shop Yamaha fuel-water separating filters

What is a vapor separator tank (VST) filter?

This filter is attached to the electric fuel pump in the VST and filters gas again just before it’s pressurized into the fuel injection rail(s). The VST is a prime spot in the fuel system where deposits and gum can form, particularly if fuel is untreated. Protect this filter by consistently treating every tank of fuel with Yamaha Ring Free Plus and regularly inspect and service the first two filters in the fuel line. Refer to the specific engine’s service manual for the recommended service interval and the exact location of the filter. Shop Yamaha VST filters

What is a primary on-engine fuel filter?

This Yamaha fuel filter is typically on the front, side, or rear of the powerhead, and is usually made of plastic you can see through. It filters fuel coming into the outboard. This “primary” filter usually features a small water trap at the bottom of the cup. This is the first filter after the 10-micron filter, so if there’s water in here, it’s time to change your 10-micron. On Yamaha outboards, there may be a red ring visible inside this filter. Don’t ever remove it. If it’s floating, you’ve got water in this filter’s small water trap and it time for a change. Shop Yamaha primary on-engine filters

What is an in-line fuel filter?

Some models have an in-line filter between the primary fuel pump and the VST (vapor separator tank) and/or in the fuel line between the VST and the fuel rail, located along the top of the outboard. Refer to your service manual or contact your dealer for the exact location for your model.

Shop Yamaha in-line filters

What is a fuel injector screen?

These are built into each fuel injector. They’re very fine-mesh screens and are not user-serviceable. If debris somehow makes it here, the fuel injectors must be removed and professionally cleaned, or replaced—reason enough to inspect and/or change your fuel filters regularly. 

Shop Yamaha fuel injector screens

Why is my Yamaha outboard fuel system important?

The fuel system is composed of the fuel pump, fuel filter, check valves, fuel hoses, fuel pump diaphragm, and injectors. Listen for the operation sound. If you can’t hear the system attempting to work, check for continuity between the fuse holder, fuse, fuel pump relay, and wiring harness. Repair or replace the defective part(s) if there is no continuity. If there is continuity, replace the electrical fuel pump. If you hear the operation sound, check each part of the fuel system individually. 

First, inspect the Yamaha fuel filters and look for clogs, cracks, kinks, or leaks in the hoses. Replace any parts with damage. Next, check the diaphragm for cracks or other signs of damage. Then, check the vapor separator needle valve for bends or signs of wear. The next step is to check the injectors for clogs and resistance. Then, check for poor connections.

Finally, note if there is any water in the fuel. Ethanol gasoline attracts water, which negatively impacts the combustibility of the fuel. This is especially likely if you haven’t used fuel additives or stabilizers. Water in the fuel may also cause a bad or failing fuel pump. If you find water in your fuel, you may want to check that the pump is in good condition. 

You can perform a Yamaha outboard fuel pump test by removing the spark plug wire boot from the spark plug and then removing the spark plug with a plug socket and wrench. Attach a compression gauge into the spark plug socket. If you have an electric motor, you may need a second person to crank your engine over while you twist your throttle position open. Otherwise, you can push the throttle open with one hand and pull the rope start.

What does VST stand for Yamaha?

VST stands for Vapor Separator Tank in Yamaha outboard motors. The VST is an important component of the fuel delivery system in Yamaha outboards and is designed to separate water remove excess fuel vapors from the fuel that is supplied to the engine.

How often do you change a fuel filter on a Yamaha?

The frequency of fuel filter changes in Yamaha outboard motors can vary depending on the specific model and usage conditions. However, as a general rule, Yamaha recommends replacing the fuel filter element every 100 hours of operation or at least once a year, whichever comes first. It's also a good idea to inspect the fuel filter regularly for signs of damage or clogging and replace it as needed.

What is a VST fuel filter?

A VST fuel filter is a specialized fuel filter that is located in the Vapor Separator Tank of Yamaha outboard motors. The VST fuel filter is designed to remove impurities and debris from the fuel before it is delivered to the engine. The VST fuel filter is an important component of the fuel delivery system in Yamaha outboards and should be inspected and replaced regularly to ensure proper engine performance and longevity.

What is the best fuel for Yamaha outboard?

Yamaha recommends using a high-quality, ethanol-free gasoline with a minimum octane rating of 87 (R+M/2). Ethanol can cause issues with fuel system components and performance, so it's important to use a fuel that is free from ethanol or has a low ethanol content. Yamaha also recommends using a fuel stabilizer if the engine will not be used for an extended period of time or if the fuel will be stored for more than 30 days.

What are the symptoms of clogged VST filter on a Yamaha outboard engine?

The symptoms of bad VST filter Yamaha can be hard to detect. 

A clogged VST filter can cause a range of symptoms on a Yamaha outboard engine. The symptoms of bad VST filter Yamaha can include poor acceleration, difficulty starting, rough idling, stalling, and reduced fuel efficiency. If you notice any of these symptoms occur from a VST filter Yamaha produces, it is important to have your Yamaha outboard engine inspected by a qualified marine mechanic to determine if the Yamaha VST filter needs to be replaced or cleaned.

Can I rebuild the VST nozzle on my Yamaha outboard engine?

While some other components part of the VST system, such as the filter, can be replaced, VST nozzles on a Yamaha outboard engine is not designed to be rebuilt. If the VST nozzle is damaged or malfunctioning, it is recommended to replace it with a new part or have it repaired by a qualified marine mechanic.

What is the Yamaha VST filter replacement cost?

The cost of replacing the VST filter on a Yamaha outboard engine can vary depending on the model and the location where the service is performed. In general, the cost of a Yamaha VST filter replacement can range from $200 to $500, which includes the cost of the filter itself and labor. However, if additional repairs or maintenance are required, the cost can be higher.

What is a VST filter on a Yamaha outboard engine?

The VST (Vapor Separator Tank) filter is an important component of the fuel system on Yamaha outboard engines. The VST filter is designed to filter out any debris or contaminants in the fuel before it enters the engine. If the VST filter becomes clogged or damaged, it can cause a variety of issues with the engine's performance, such as poor acceleration, rough idling, and stalling.

Can I use a VST filter from a different brand on my Yamaha outboard engine?

It is not recommended to use a VST filter from a different brand on a Yamaha outboard engine. The VST filter is specifically designed and engineered to meet the fuel system requirements of Yamaha outboard engines, and using a filter from a different brand can result in poor engine performance and potentially voided warranties. It is recommended to use Yamaha genuine parts and accessories, including the VST filter, for optimal engine performance and reliability.

Where is the Yamaha outboard f225 VST filter location?

The Yamaha F225 outboard motor's VST (Vapor Separator Tank) filter is located inside the VST tank, which is mounted on the engine's port side.

Where is the Yamaha outboard f250 VST filter location?

The Yamaha F250 outboard motor's VST (Vapor Separator Tank) filter is located inside the VST tank, which is mounted on the engine's port side. The VST filter element is not easily accessible and is typically replaced as a unit when it becomes clogged or dirty.

How to clean Yamaha VST filter?

Cleaning a Yamaha VST (Vapor Separator Tank) filter is generally not recommended as the filter element is designed to be replaced when it becomes clogged or dirty. However, it may be necessary to clean the inside of the VST tank itself. This is important because the VST tank collects any impurities or debris that may be present in the fuel before it reaches the engine. Over time, these impurities can accumulate and affect the performance of the engine.

What does VST Yamaha outboard performance mean?

VST stands for "Vapor Separator Tank" and refers to a component in Yamaha outboard motors that is responsible for separating the fuel from the air before it enters the engine. The VST is an important part of the fuel delivery system and helps ensure that the engine receives a consistent supply of clean fuel. It also helps reduce emissions and improve fuel efficiency.

Is there a Yamaha filter in VST tank?

Yes, many Yamaha outboard motors have a VST (Vapor Separator Tank) that contains a fuel filter element. The filter is designed to remove impurities and debris from the fuel before it reaches the engine, helping to ensure optimal performance and reliability. However, the specific design and location of the filter may vary depending on the model and year of the Yamaha outboard motor.

How to do a 2003 Yamaha f115 VST filter replacement?

Replacing the VST filter on a 2003 Yamaha F115 outboard motor involves several steps. Here is a general guide on how to do it:

1. Turn off the fuel supply and disconnect the battery to prevent accidental starting of the engine.

2. Locate the VST tank, which is typically located on the port side of the engine and looks like a small canister.

3. Remove the VST tank by disconnecting the fuel lines, electrical connections, and bolts that secure it to the engine. Be sure to have a clean container to catch any fuel that may spill.

4. Once you have the VST tank removed, carefully unscrew the top cap and remove the old filter element. Be sure to clean the inside of the tank using a lint-free cloth.

5. Install the new Yamaha outboard VST filter element into the cap, making sure it is properly seated and aligned with the housing. Apply a small amount of grease to the O-ring on the cap to ensure a proper seal.

6. Reinstall the cap and Yamaha VST filter replacement into the VST tank, and then reinstall the tank onto the engine. Tighten the bolts and reconnect the fuel lines and electrical connections.

7. Reconnect the battery and turn on the fuel supply.

8. Start the engine and let it idle for a few minutes to ensure proper fuel flow and check for any leaks.

Note: These are general guidelines, and specific procedures may vary depending on the model and year of your Yamaha F115 outboard motor. Always refer to the manufacturer's instructions and safety precautions before attempting any maintenance or repair.

How long does a Yamaha VST tank filter last?

The lifespan of a Yamaha VST (Vapor Separator Tank) filter depends on a variety of factors, such as the frequency of use, the quality of fuel, and the conditions in which the outboard motor is operated. However, as a general rule of thumb, Yamaha recommends that the VST filter be replaced every 3 years or 300 hours of operation, whichever comes first, as part of routine maintenance.

What are the most popular Yamaha VST filter kits that PartsVu sells?

If it’s time for a Yamaha VST filter change, you may be looking for Yamaha VST filter kit reviews. Where you’re looking to just replace the filter or purchase a whole VST fuel filter kit, the following are the most available kits and components to help you maintain your Yamaha outboard engine:

Yamaha VST Filte Kits (including most common searches):

• Yamaha F115 VST Filter Kit

  • VST Filter Yamaha 115 Kit 

  • VST Filter Yamaha F115 Kit 

  • Yamaha 115 4 stroke VST Filter Kit

  • Yamaha 115 outboard VST Filter Kit

  • Yamaha 115 VST Filter Kit

  • Yamaha 115 VST Filter Replacement Kit

  • Yamaha F115 VST Filter Kit

  • Yamaha F115 VST Filter Replacement Kit

  • Yamaha 115 VST Filter change Kit

  • Yamaha F115 VST Filter change Kit

• Yamaha F150 VST Filter Kit

  • VST Filter Yamaha 150 Kit

  • VST Filter Yamaha F150 Kit

  • Yamaha 150 HPDI VST Filter Kit

  • Yamaha 150 VST Filter Kit

  • Yamaha F150 VST Filter Kit

  • Yamaha F150 VST Filter Replacement Kit

• Yamaha 200 HPDI VST Filter Change Kit

  • Yamaha 200 HPDI VST Filter Kit

• VST Filter Yamaha 225 Kit

  • Yamaha 225 VST Filter Kit

  • Yamaha F225 VST Filter Kit

• Yamaha 250 HPDI VST Filter Kit

  • Yamaha F250 VST Filter Kit

• Yamaha F300 VST Filter Change Kit 

  • Yamaha 300 HPDI VST Filter Kit

By Year

• 2001 Yamaha 150 HPDI VST Filter Kit

• 2001 Yamaha F115 VST Filter Kit

• 2002 Yamaha F225 VST Filter Kit

• 2003 Yamaha F115 VST Filter Kit

• 2004 Yamaha 115 VST Filter Kit

• 2004 Yamaha F115 VST Filter Kit

• 2004 Yamaha F150 VST Filter Kit

• 2005 250 VST Filter Yamaha HPDI

• 2005 Yamaha F115 VST Filter Kit

• 2005 Yamaha F150 VST Filter Replacement Kit

• 2005 Yamaha F225txrd VST Filter Kit

• 2005 Yamaha F250 VST Filter Kit

• 2006 Yamaha F115 VST Filter Kit

• 2008 Yamaha 150 VST Filter 4 stroke Kit

• 2011 Yamaha 115 4 stroke VST Filter Kit

• 2011 Yamaha F115 VST Filter Kit

• 2012 Yamaha F150 VST Filter Kit

• 2015 Yamaha 115 VST Filter Kit

What does VST filter Yamaha HPDI mean?

VST (Vapor Separator Tank) filter in Yamaha HPDI outboard motors refers to a crucial part of the fuel delivery system. Yamaha's High-Pressure Direct Injection (HPDI) outboard motors use a VST tank to separate fuel vapor from the liquid fuel and provide a consistent flow of clean, filtered fuel to the engine. The VST filter is a replaceable element located inside the VST tank that traps any debris or impurities that may be present in the fuel.