Quick Answer
Changing fuel before using a stored generator is not strictly necessary, but it's highly recommended to ensure the generator starts easily and runs efficiently. Old fuel can leave behind varnish and gum, which can clog the engine and fuel system. Storing the generator with fresh fuel is the best practice.
Storing the Generator with Fresh Fuel
When storing a generator for long periods, it’s crucial to fill the fuel tank with fresh, high-quality fuel. Choose a fuel that meets or exceeds the manufacturer’s specifications. For example, if the generator requires 87-octane fuel, use a 91-octane or higher fuel to ensure it remains stable and doesn’t break down over time. Fill the tank to the recommended level, but don’t overfill it. Leave about 1/4 of the tank empty to allow for expansion and contraction.
Preventing Fuel Breakdown and Clogging
After filling the tank, run the generator for 15-30 minutes to burn off any fuel that may have degraded during storage. This process is called “conditioning the fuel.” This helps to prevent varnish and gum from forming, which can clog the engine and fuel system. After conditioning the fuel, shut off the generator and let it sit for 24 hours to allow the engine to cool down completely.
Maintenance and Inspection
Before using the stored generator, inspect the fuel system for any signs of clogging or contamination. Check the fuel filter, fuel lines, and carburetor or fuel injectors for any blockages or varnish buildup. If you find any issues, replace the affected components or clean them according to the manufacturer’s instructions. Additionally, check the generator’s oil level and condition, and change it if necessary. Performing regular maintenance and inspections will help ensure the generator runs smoothly and efficiently when you need it.
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