Preparing Your Car for Long-Term Storage: Handling Old Gasoline Effectively
When a car hasn't been driven for an extended period, the old gasoline in the tank may not be suitable for use. Numerous factors can degrade the fuel, leading to potential engine issues if left unused for too long. This guide highlights key points to consider when dealing with old gas and provides recommendations for maintaining your vehicle's fuel system during long-term storage.
Understanding Gasoline Degradation
Formation of Varnish and Gum Deposits: Gasoline begins to break down after about three months, leading to the formation of varnish and gum deposits. These deposits can clog fuel lines and filters, causing significant issues when you try to start the car.
Ethanol Content and Phase Separation: Modern gasoline often contains ethanol, which is hydroscopic, meaning it can absorb moisture from the air. This can lead to phase separation, where water settles at the bottom of the tank and can be harmful to the engine. The risk of these issues increases the longer the gasoline sits in the tank.
Odor and Appearance as Indicators of Fuel Degradation
If the gas smells stale or appears darker in color, it is likely degraded and should be removed. Stale fuel can contain harmful byproducts that can damage your engine if used.
Recommendations for Long-Term Storage
Draining the Old Fuel: Generally, it is advisable to drain the old fuel and replace it with fresh gasoline. This practice is especially important if the car has been sitting for an extended period. Additionally, it may be necessary to check and possibly replace the fuel filter to ensure the fuel system is clean and free of debris.
Checking the Fuel System: Inspect the fuel system for any issues that may have developed during the period of inactivity. Addressing these issues before starting the car can save you from potential engine problems.
Variables in Fuel Degradation
Defining "A Long While": The duration for which a car can remain unused without issues varies. Six to seven months should be fine if the tank was at least 3/4 full. However, moisture can condense if too much air is in the tank, increasing the risk of problems. Proper sealing of the fuel system and adding a fuel stabilizer can extend the usable life of the gasoline.
Modern Gasoline and Ethanol Content: With the presence of ethanol in modern gasoline, the risk of phase separation and water contamination is higher. Ethanol is highly corrosive, and its absorption of moisture can occur within a year or take longer, depending on storage conditions and atmospheric factors.
Storage Additives: If you need to store your car for more than a few months, consider adding a fuel stabilizer to the fuel. Auto supply stores can provide guidance on which additives are suitable for your specific situation.
Conclusion: To avoid potential engine problems, it is best to remove old gasoline and replace it with fresh fuel before using your vehicle. Addressing the fuel system and ensuring it is in good condition can help maintain the performance and longevity of your car.