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What kind of fuel should be used to avoid spark plug issues?

April 5, 2026

Quick Answer

To avoid spark plug issues, use unleaded gasoline with an octane rating of 87 or higher. This type of fuel is less likely to cause spark plug fouling and damage. Storing fuel in a well-sealed container can also help prevent deterioration and contamination.

Choosing the Right Fuel for Your Generator

When choosing a fuel for your generator, it’s essential to select a high-quality, unleaded gasoline that meets the recommended octane rating. A minimum of 87 octane is recommended, but higher octane ratings such as 91 or 93 can provide even better performance and engine protection. Using lower octane fuel can lead to knock or pinging, which can cause damage to your engine and spark plugs.

Proper Fuel Storage and Handling

Proper fuel storage and handling are also crucial to preventing issues with your generator’s spark plugs. Make sure to store fuel in a well-sealed container, away from direct sunlight and heat sources. Always use a fuel container that is specifically designed for storing gasoline, and never store fuel for extended periods of time. If you must store fuel for an extended period, consider adding a fuel stabilizer to prevent deterioration and contamination.

Tips for Preventing Spark Plug Fouling

In addition to using high-quality fuel and storing it properly, there are several other steps you can take to prevent spark plug fouling and damage. Regularly check and maintain your generator’s air filter and spark plug, and make sure to change the spark plug every 100-200 hours of operation. Also, ensure that your generator is properly tuned and maintained according to the manufacturer’s recommendations.

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