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Will Using Old Fuel Damage My Generator Engine?

April 5, 2026

Quick Answer

Using old fuel in your generator engine can potentially cause damage due to degradation over time and the accumulation of contaminants.

Fuel Degradation Risks

Old fuel can become contaminated with water, sludge, and bacteria, which can lead to clogged fuel injectors, engine corrosion, and overall engine damage. Fuel that has been stored for more than 6-12 months is considered old and should be treated with caution. When stored properly, fuel can last up to 2 years, but it’s essential to check its quality before use.

Effects of Old Fuel on Generator Engines

The effects of old fuel on generator engines can be severe. If you’ve stored your generator for an extended period, it’s crucial to have it serviced before refueling. Old fuel can cause the fuel system to clog, leading to reduced engine performance, increased emissions, and potentially costly repairs. In severe cases, old fuel can cause engine failure, requiring replacement of the engine or the entire unit.

Best Practices for Generator Storage and Maintenance

To minimize the risks associated with old fuel, it’s essential to follow best practices for generator storage and maintenance. First, store your generator in a dry, well-ventilated area, away from direct sunlight and moisture. Use a fuel stabilizer to prevent fuel degradation and add it to the fuel tank before storage. When refueling, use fresh fuel and drain the old fuel from the tank before storing the generator again. Regular maintenance, including oil changes and filter replacements, can also help prevent engine damage.

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