How Long Can You Leave Gas in a Generator


How Long Can You Leave Gas in a Generator?

Generators are a valuable resource during power outages or when off-grid electricity is required. However, many generator owners are unsure about how long they can leave gas in their generator without causing damage or affecting its performance. In this article, we will explore this topic and provide answers to some frequently asked questions regarding gas storage in generators.

The general consensus among experts is that you should not leave gas in a generator for more than 30 days without any usage. Gasoline can deteriorate over time due to oxidation, moisture, and exposure to air. This can lead to the formation of varnish and gum deposits that can clog the carburetor and fuel lines, resulting in engine starting issues. Therefore, it is advisable to drain the fuel tank if the generator is not going to be used for an extended period.


1. Can I use a fuel stabilizer to prolong the shelf life of gasoline in a generator?
Yes, using a fuel stabilizer can help extend the life of gasoline in a generator. Follow the manufacturer’s instructions for the correct dosage.

2. What should I do if I have old gas in my generator?
If you have old gas in your generator, it is best to drain it completely and refill with fresh gasoline. Old gas can cause starting problems and damage the generator’s components.

3. Can I store my generator with an empty fuel tank?
It is not recommended to store a generator with an empty fuel tank. Without any fuel, moisture can accumulate inside the tank, leading to corrosion.

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4. How often should I run my generator to prevent fuel issues?
It is recommended to run your generator for at least 30 minutes every month to prevent fuel-related problems. This helps keep the fuel system clean and ensures proper functioning.

5. Can I use ethanol-blended gasoline in my generator?
Ethanol-blended gasoline can be used in generators, but it is important to use fuel stabilizers specifically designed for ethanol-blended fuels to prevent any potential issues.

6. Are there any alternative fuel options for generators?
Yes, there are alternative fuel options available for generators, such as propane and diesel. These fuels have a longer shelf life and are less prone to degradation.

7. How can I properly dispose of old gasoline from my generator?
Contact your local waste management facility or recycling center for guidance on how to safely dispose of old gasoline. Do not pour it down drains or throw it in regular trash bins.

In conclusion, it is recommended not to leave gas in a generator for more than 30 days without any usage. By following proper fuel storage and maintenance practices, you can ensure the longevity and optimal performance of your generator.