Rajan Wilcox
Disconnecting the fuel line from a Yamaha outboard motor is a procedure that should be carried out with care to avoid gas leaks. Yamaha outboards have a fuel system that includes a 10-micron filter that traps impurities and water, which must be regularly inspected and serviced. When disconnecting the fuel line, it is important to check for any signs of leaks or cracking in the fuel hoses and connections. Some people recommend running the engine until it stops to burn off excess fuel, but this may not be necessary if the boat is used regularly. It is also important to consider the potential for water collection in the fuel tank due to the presence of ethanol in today's fuel supply.
| Characteristics | Values |
|---|---|
| Fuel type | Ethanol-based |
| Fuel tank type | External |
| Fuel line filter | 10-Micron Fuel/Water Separating Filter |
| Fuel Injector Screen | Built into each fuel injector |
| Fuel bulb | Check valve prevents drain back |
| Fuel stabilizers | Marine Stabil, Yamaha Internal Engine Cleaner |
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What You'll Learn
Preventing gas leaks
To prevent gas leaks in your Yamaha outboard motor, there are several steps you can take. Firstly, it is important to regularly check for any signs of leaks or cracking in the fuel hoses and connections. This should be done visually and physically each time you use your boat. Yamaha recommends treating every tank of fuel and regularly inspecting and servicing the first two filters in the fuel line.
One way to prevent gas leaks is to install a 10-Micron Fuel/Water Separating Filter in the outboard fuel line. This filter traps impurities and allows water to sink to the bottom of the filter and out of the fuel. By applying a thin film of clean engine oil to the fuel filter gasket before installing a new fuel filter, you can make it easier to remove when necessary.
Additionally, Yamaha recommends treating every tank of fuel to help protect the Vapor Separator Tank (VST) Filter. The VST filter is located in the electric fuel pump and can be a prime spot for deposits and gum to form, especially if the fuel is untreated. Regularly inspecting and servicing this filter can help prevent gas leaks.
It is also important to note that ethanol is commonly added to today's fuel supply, and while it helps reduce emissions, it can attract water molecules. This can lead to water collecting in your fuel tank, which may result in running problems or even catastrophic damage.
Finally, some users recommend running the engine until it shuts off by itself to prevent gas leaks. However, others suggest that this is not necessary and that simply turning off the key is sufficient.
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Using a fuel/water separator
Yamaha outboard motors come with fuel/water filters that need to be checked and changed every 50 hours of operation. These filters are important because they prevent water and debris from entering your engine, which can cause significant damage.
Ethanol is added to most of today's fuel supply to help reduce emissions and extend domestic fuel supplies. However, ethanol is a type of alcohol, which is "hygroscopic," meaning it attracts water molecules. As a result, water will inevitably collect in your fuel tank, and when the concentration of water molecules reaches just 0.5%, they will sink to the bottom of your fuel tank, where your fuel pick-up is located. This can lead to running problems or even catastrophic engine damage.
To prevent this, Yamaha recommends using a 10-micron fuel/water separator filter, which is designed to trap impurities as small as 1/20th of the diameter of a human hair. This filter should be installed in the outboard fuel line between your fuel tank and your outboard, allowing water to sink to the bottom of the filter and out of the fuel. It is also recommended to proactively fill a new replacement filter about 3/4 full with fresh, stabilized fuel before installation to make priming the fuel system quicker and easier. Additionally, applying a thin film of clean engine oil to the fuel filter gasket will make it easier to remove when it's time to replace the filter.
It is important to note that the primary on-engine filters should be replaced after every 100 hours of engine operation, and the Vapor Separator Tank (VST) filter, which is attached to the electric fuel pump, should be regularly inspected and serviced as it is a prime spot for deposits and gum to form, especially if the fuel is untreated. In-line filters should also be replaced after every 100 hours of operation.
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Draining the carb
First, it is important to understand that simply pulling the fuel line off and letting the engine run until it stops does not completely drain the carb. It only lowers the fuel level in the float bowl. To truly empty the carb, you need to remove the drain plug. This is an important step to prevent fuel leaks inside your car during transport.
When you run the engine dry, it will eventually shut off when there is no more fuel to burn. This method can be effective in preventing fuel rot, as the absence of fuel creates a void in the fuel system, reducing the chances of condensation and water accumulation. However, some people argue that running the engine dry is not necessary and can be a waste of time and fuel.
If you choose to run the engine dry, it is crucial to consider the type of engine you have. For example, a 2-stroke engine runs on a mixture of gas and oil. By running it out of gas, you are also running it out of oil, which may not be advisable as it could lead to potential engine issues.
Additionally, it is worth noting that fuel has a shelf life of about three months before it starts to break down and lose its octane rating. This can result in fuel rot or the formation of varnish, which can cause performance issues. Therefore, if your outboard motor will not be used for an extended period, it is advisable to drain the carb completely to prevent these issues.
To summarise, while there are different schools of thought on whether to drain the carb after each use, it is generally recommended to do so, especially if the motor will be stored or not used for a prolonged period. This helps prevent fuel-related issues and ensures the long-term health of your outboard motor.
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Flushing the cooling system
Step 1: Prepare the Engine
Before flushing the cooling system, ensure that your engine is turned off and has cooled down. This will allow the components to be handled safely and reduce the risk of burns or injuries.
Step 2: Locate the Cooling System Components
Familiarize yourself with the location of the cooling system components, including the water intake, water pump, thermostat, and water outlet. Refer to your Yamaha outboard motor manual for detailed diagrams and information.
Step 3: Connect a Flushing Device
Attach a flushing device, such as a garden hose, to the water intake of the cooling system. Ensure that the hose is securely connected to prevent leaks or disconnections during the flushing process.
Step 4: Run Fresh Water Through the System
Turn on the water supply and run fresh water through the cooling system. Let the water flow for several minutes to ensure that it circulates thoroughly and flushes out any debris, salt, or buildup.
Step 5: Monitor the Engine
While flushing, keep an eye on the engine's temperature gauge. It is important to ensure that the engine does not overheat during the flushing process. If the temperature rises too high, adjust the water flow or consult a marine mechanic for further advice.
Step 6: Drain the System
After flushing, turn off the water supply and disconnect the hose from the water intake. Allow the system to drain completely, ensuring that all water has been removed from the engine.
Step 7: Re-attach Hoses and Connections
Once the system is drained, carefully re-attach all hoses and connections to their respective locations. Ensure that all components are securely fastened to prevent leaks during operation.
Step 8: Inspect for Leaks
Before starting the engine, inspect the cooling system for any signs of leaks or loose connections. Tighten any fittings or clamps as needed to ensure a watertight seal.
Step 9: Start the Engine
Start the engine and let it run for a few minutes. Monitor the temperature gauge to ensure that the cooling system is functioning properly.
Step 10: Regular Maintenance
Regularly inspect and maintain your Yamaha outboard motor's cooling system. This includes checking the condition of hoses, belts, and clamps, as well as replacing the engine coolant at recommended intervals. Refer to your owner's manual for specific maintenance schedules and procedures.
Remember to always exercise caution when working on your outboard motor. If you are unsure about any aspect of the flushing process, it is best to consult a qualified marine technician for assistance.
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Installing a 10-Micron Fuel/Water Separating Filter
- Purchase the Correct Filter: Yamaha outboard models with 115 HP or less may require a specific filter (MAR-MINIF-IL-TR Fuel/Water Separating filter). Check your boat's current setup and consult the manufacturer or dealer if you are uncertain about the correct filter for your model.
- Prepare the New Filter: Before installation, it is recommended to fill the new filter about 3/4 full with fresh, stabilized fuel. This step will make priming the fuel system easier after installation.
- Apply Engine Oil to the Gasket: As suggested by Yamaha, apply a thin layer of clean engine oil to the fuel filter gasket. This will make removing the filter easier when it's time for a replacement.
- Install the Filter: Place the 10-Micron Fuel/Water Separating Filter in the outboard fuel line between your fuel tank and the outboard motor. Ensure that the filter is securely connected and accessible for future maintenance.
- Prime the Fuel System: After installation, prime the fuel system by following the standard procedure for your Yamaha outboard motor. Refer to your owner's manual for specific instructions.
- Regular Maintenance: In-line filters, such as the primary on-engine filters, should be replaced regularly. Yamaha recommends replacing these filters after every 100 hours of engine operation. Additionally, remember to inspect and service the first two filters in the fuel line regularly.
By following these steps, you can effectively install a 10-Micron Fuel/Water Separating Filter on your Yamaha outboard motor, helping to maintain the engine's performance and longevity. Remember to consult your owner's manual and seek professional advice if you have any questions or concerns during the installation process.
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Frequently asked questions
To avoid gas leaks inside your car, close the vent on the external tank and disconnect the hose. Then, let the motor run until it stops.
No, you only need to disconnect the fuel line when it's not going to be used for a while. However, make sure to check the fuel bulb before cranking to ensure it's properly aligned.
To fully drain the carb, you need to remove the drain plug. Simply letting the motor run until it stops only lowers the fuel level in the float bowl.
