Ethanol in gasoline for outboard motors

Ethanol is a type of alcohol that is commonly added to gasoline as a fuel additive. While ethanol can have some benefits as a fuel additive, it can also be problematic for outboard motors.

One of the main issues with using ethanol in outboard motors is that it can attract moisture. Ethanol is hygroscopic, which means that it absorbs moisture from the air. This can lead to corrosion in the fuel system, as the moisture can cause rust and other types of damage to the fuel lines, fuel pump, and other components. Corrosion can cause a variety of issues, including reduced performance and potentially even engine failure.

In addition to attracting moisture, ethanol can also cause the fuel to break down more quickly. This is because ethanol is more prone to oxidation than gasoline, which means that it can break down and form deposits in the fuel system over time. This can lead to performance issues and may require more frequent fuel filter changes.

Ethanol can also cause the fuel to burn less efficiently, which can lead to reduced fuel economy. This is because ethanol has a lower energy density than gasoline, which means that it produces less energy when it burns. This can lead to reduced performance and may require the engine to work harder to achieve the same level of power, which can lead to increased fuel consumption. This can be especially problematic for boats that are used for extended periods of time, as the reduced fuel efficiency can add up over time.

Overall, it is generally best to avoid using fuels that contain a high percentage of ethanol in outboard motors. While ethanol may be more readily available and often less expensive than non-ethanol fuels, the potential issues that it can cause may not be worth the cost savings. Instead, it may be better to pay a little extra for a fuel that is formulated specifically for use in outboard motors and is less likely to cause problems. Some options to consider include ethanol-free gasoline or marine-specific fuels, which are formulated with additives to help prevent corrosion and other issues. It is also a good idea to check with the manufacturer of your outboard motor to see if they have any specific recommendations for fuels to use or avoid.

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