Can I Leave Fuel in the Generator Tank?

Fuel Breakdown and Degradation

Fuel can break down over time due to oxidation and contamination. Gasoline, for example, can go bad in as little as 30 days if not stored properly. The rate of degradation increases with temperature, humidity, and exposure to light. To minimize this risk, store the generator in a cool, dry place, and keep the fuel tank lid tightly sealed. If you won’t be using the generator for an extended period, consider draining the tank and replacing the fuel with fresh stock.

Tank Clogging and Fuel System Issues

Leaving fuel in the tank can cause varnish and sediment buildup, which can clog the fuel system and engine. This can lead to costly repairs and even engine failure. A general rule of thumb is to drain the tank every 3 to 6 months to prevent these problems. You can also use fuel stabilizers to help slow down degradation and prevent tank clogging. However, these additives should not be relied upon as a replacement for regular tank draining.

Draining and Cleaning the Fuel Tank

To drain the fuel tank, locate the drain valve at the bottom of the tank and attach a fuel drain hose to it. Direct the hose to a container and slowly open the valve to drain the fuel. Once the fuel has been drained, use a solvent or cleaning solution to clean the tank and fuel system. This will help remove any debris or residue that may have accumulated during storage. After cleaning, replace the drain valve and refill the tank with fresh fuel.