Can I Reuse Old Fuel if I Add Stabilizer?

Fuel Degradation and Stabilizers

When you store fuel for extended periods, natural degradation processes occur. These processes can lead to the formation of gum, varnish, and other sludge-like substances. These contaminants can clog fuel lines, harm engines, and decrease fuel efficiency. Adding a fuel stabilizer, typically a mixture of chemicals, aims to slow down these degradation processes. However, the effectiveness of fuel stabilizers varies depending on factors like fuel type, storage conditions, and exposure to air, moisture, and heat.

Types of Fuel Stabilizers

There are two primary types of fuel stabilizers: additive-based and oxygen-absorbing. Additive-based stabilizers are the most common type. They work by dispersing additives into the fuel, which helps prevent oxidation and the growth of bacteria. However, their effectiveness typically lasts for a short period - around 30 to 60 days, depending on storage conditions. Oxygen-absorbing stabilizers, on the other hand, work by absorbing oxygen in the fuel, which can help prevent degradation. However, these types of stabilizers often have limited capacity to absorb oxygen, typically up to 1-2% of the fuel’s volume.

Best Practices for Generator Storage

To extend the shelf life of fuel for long-term generator storage, consider the following best practices: Store fuel in airtight containers to prevent exposure to air and moisture. Keep the fuel away from direct sunlight, heat sources, and potential ignition sources. Use a fuel stabilizer specifically designed for the type of fuel you’re storing. For gasoline, a 2-4% mixture of stabilizer is typically recommended. For diesel fuel, a 1-2% mixture is usually sufficient. Regularly inspect stored fuel for signs of degradation, such as sludge formation or a strong, unpleasant odor. If you notice any issues, it’s best to discard the fuel and replace it with fresh fuel.