Katerina Swanson
The Yamaha F115 outboard engine has two fuel filters. The first is a cup/strainer filter, which can be found by pulling off the engine cover and following the fuel line into the lower cowl. The second is inside the vapor-separating tank (VST), which sits behind the intake manifold. The VST should be opened annually and cleaned out, with the filter underneath the fuel pump either cleaned or replaced. For frequently used boats, the primary fuel filter should be replaced annually or every 100 hours of operation, whichever comes first.
| Characteristics | Values |
|---|---|
| Engine | Yamaha F115 outboard |
| Filter Location | Between the lift pump and the VST |
| Filter Replacement | Annually or every 100 hours of operation, whichever is first |
| Filter Purpose | To strain out dirt, debris, and other contaminants |
| Filter Cost | $25 for just the filter, $48 for the entire line |
| Engine Issues | Engine stalls, misfires, loss of power, difficulty starting |
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What You'll Learn
The fuel filter location on a Yamaha F115 outboard
The Yamaha F115 outboard engine has two fuel filters. The first is a cup/strainer filter, which can be found by pulling off the engine cover and following the fuel line into the lower cowl. It is the first thing that the fuel line touches. If you are facing the rear of the engine, it will be on the left-hand side.
The second filter is inside the vapor-separating tank (VST). This is the tank that sits behind the intake manifold, and the high-pressure fuel pump sits inside it. The filter is below the fuel pump and should be cleaned or replaced annually.
It is important to maintain the fuel filters to ensure the engine is running optimally. A clogged fuel filter can cause the engine to stall or misfire, lead to poor fuel economy, cause difficulty starting the engine, and result in a loss of engine power.
For frequently used boats, it is recommended to replace the primary fuel filter annually or every 100 hours of operation, whichever comes first. Fuel quality can also influence this schedule, with lower-quality fuel requiring more frequent filter replacements.
When replacing the fuel filter, it is important to consult the Yamaha owner's manual for model-specific guidelines and maintenance schedules.
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The fuel filter's function and importance
The Yamaha F115 is an outboard model with two fuel filters. The first is a cup/strainer filter, and the second is located inside the vapor-separating tank (VST). The filter inside the VST is below the high-pressure fuel pump.
Fuel filters are critical components of fuel systems, screening out foreign particles or liquids from the fuel. Unfiltered fuel can contain various contaminants, such as paint chips, dirt, and rust, which can cause accelerated wear and failure of the fuel pump and injectors. These contaminants can enter the fuel tank during filling or be the result of moisture in a steel tank.
Most internal combustion engines use fuel filters to protect the components in the fuel system. The filters are typically made of cartridges containing filter paper and need to be maintained or replaced regularly.
Primary fuel filters, also known as fuel filter water separators, separate water from the fuel. Water can cause significant damage to vital components, leading to reduced efficiency, component failure, and corrosion. The water accumulated in the primary filter can be drained through the filter drain valve during service intervals.
Secondary fuel filters capture contaminants that are invisible to the naked eye and operate under much higher pressures than primary filters. They are the last line of defence in protecting the highly sensitive and expensive components of modern high-pressure common rail (HPCR) fuel systems.
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Replacing the primary fuel filter
The primary fuel filter is typically located between the fuel tank and the engine. It is the first filter that the fuel passes through and is designed to remove larger particles and debris from the fuel before it reaches the secondary fuel filter. The primary fuel filter plays a pivotal role in maintaining the performance of your Yamaha F115 outboard engine. It strains out any dirt, debris, or other contaminants in the fuel before it reaches the engine, preventing potential damage and maintaining the engine's optimal performance.
When to Replace the Primary Fuel Filter:
The frequency of fuel filter replacement depends on several factors, including the model, usage, and operating conditions. It is generally recommended to replace the fuel filter at least once a year or every 100 hours of use, whichever comes first. However, if you notice any signs of a clogged or dirty filter, such as reduced performance or engine hesitation, it may be necessary to replace the filter more frequently. Additionally, if your boat is operated in areas with poor fuel quality, you might need to replace the filter more often to prevent engine damage.
Signs that the Primary Fuel Filter Needs Replacement:
- Engine stalls or misfires
- Poor fuel economy
- Difficulty starting the engine
- Loss of engine power, especially during acceleration
- Before replacing the primary fuel filter, it is important to consult the Yamaha owner's manual for model-specific guidelines and recommendations.
- When you are ready to replace the filter, start by pulling off the engine cover.
- Follow the fuel line into the lower cowl. The primary fuel filter is the first thing that the fuel line touches. It will be on the left-hand side if you are facing the rear of the engine.
- Remove the old filter and install the new one in its place, ensuring it is secure and properly connected to the fuel line.
- Depending on your Yamaha model, you may also need to clean or replace the filter inside the vapor separating tank (VST). This tank sits behind the intake manifold, and the high-pressure fuel pump is located inside it. The filter is below the fuel pump.
- It is recommended to open up the VST once a year for cleaning or replacement of the filter. You can blow out the filter with compressed air.
- After replacing the primary fuel filter and addressing the VST as needed, reassemble the engine components.
By following these steps and maintaining a regular replacement schedule, you can help ensure the optimal performance and longevity of your Yamaha F115 outboard engine.
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Signs that the fuel filter needs to be changed
The fuel filter in an F115 engine is located between the lift pump and the VST (Vapor Separating Tank). The engine has two fuel filters. The first is a cup/strainer filter, and the second is located inside the VST.
- Engine cranking and struggling to start: A clogged fuel filter can restrict the flow of fuel to the engine, making it difficult for the engine to start. You may notice the engine cranking longer than usual before turning over.
- Poor engine performance: A dirty fuel filter can cause the engine to hesitate, stumble, or surge, especially during acceleration, high speeds, or when carrying heavy loads. The engine may also sputter when turning the ignition.
- Strange noises from the fuel pump: When the fuel filter is clogged, the fuel pump has to work harder to push fuel through, which can cause it to produce strange noises.
- Low fuel pressure: As fuel struggles to flow through a clogged filter, it can result in low fuel pressure, which may trigger the check engine light.
- Irregular maintenance: Regularly maintaining and replacing your fuel filter is important. Even if you don't notice any performance issues, it's a good practice to change the fuel filter at least once a year for heavy machinery. Refer to your owner's manual for specific recommendations.
It's important to note that while these signs may indicate a clogged fuel filter, there could be other underlying issues. Always refer to your owner's manual and consult a qualified technician if you're unsure about replacing the fuel filter or if the problem persists.
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The cost of replacement parts
The entire assembly, which includes the hoses, filter cover, and other components, typically costs around $48. However, some individuals may only require the filter element itself, which can be more challenging to source individually. In one instance, a user was quoted $25 for just the filter, with the entire line costing $48.
For older Yamaha F115 models from 2006 to 2011, the primary fuel filter with the part number 6D8-WS24A-00-00 is compatible. This filter is also compatible with other Yamaha outboard models, including the F90, F75, F60, and F50.
It is important to note that the specific fuel filter and replacement parts required may vary depending on the year and model of the Yamaha F115. For example, the F115B model, introduced in 2015, utilizes the "F90" filter.
Additionally, some users have mentioned that the pre-VST filter, which is not standard from the Yamaha factory, may not provide significant benefits and can even cause issues if it clogs. In such cases, it may be replaced with a "hose joiner."
When considering the cost of replacement parts, it is advisable to consult authorized Yamaha dealers or trusted marine mechanics to ensure the correct parts are sourced and properly installed.
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Frequently asked questions
The Yamaha F115 has two fuel filters. The first is the primary fuel filter, which is the first thing that the fuel line touches when you follow the fuel line into the lower cowl. If your back is facing the rear of the engine, it would be on the left-hand side. The second is inside the vapor-separating tank (VST), which is located behind the intake manifold.
To replace the primary fuel filter, you will need to pull the engine cover off and follow the fuel line into the lower cowl. You can then remove the old filter and replace it with a new one. For the filter inside the VST, you will need to open up the VST and either clean or replace the filter.
For frequently used boats, it is recommended to replace the primary fuel filter annually or every 100 hours of operation, whichever comes first. However, fuel quality can also influence this schedule, so if you operate your boat in areas with poor fuel quality, you may need to replace the filter more frequently.
Yes, there are several signs that may indicate that you need to replace the fuel filter on your Yamaha F115. These include frequent engine stalls or misfires, decreased fuel efficiency, difficulty starting the engine, and loss of engine power, especially during acceleration.
