The smell of fresh-cut grass and the hum of a lawnmower are the hallmarks of summer. But what happens when your trusty mower sits idle for months, its fuel tank filled with forgotten gas? Does that old gas pose a threat to your lawnmower’s health? This article will delve into the potential problems associated with using old gasoline, exploring the reasons why it’s best to avoid it and offering tips on how to manage your fuel supply to keep your mower running smoothly.
In short, yes, old gas is bad for your lawnmower. As gasoline ages, it degrades, leading to a number of problems that can affect your engine’s performance and longevity. Let’s explore the details of this deterioration and its consequences.
The Chemistry of Gasoline Degradation: Why Old Gas is Trouble
Gasoline is a complex mixture of hydrocarbons, designed to burn quickly and efficiently in your mower’s engine. However, this volatile mix is susceptible to deterioration over time, undergoing chemical changes that compromise its performance.
The Role of Oxygen and Evaporation
One of the primary culprits behind gasoline degradation is oxygen. When exposed to air, gasoline starts to oxidize, forming gum and varnish deposits. These sticky residues build up in your mower’s fuel system, clogging fuel lines, injectors, and carburetors. Evaporation also plays a role, with lighter hydrocarbons evaporating faster than heavier ones, leaving behind a concentrated residue that further contributes to gum and varnish formation.
The Impact of Time and Temperature
Time and temperature are significant factors in the deterioration process. As gasoline ages, the chemical breakdown accelerates. Hot temperatures exacerbate this process, speeding up evaporation and oxidation. This is why storing gasoline in a cool, shaded location can help extend its lifespan.
The Consequences of Using Old Gas: More than Just a Bad Start
The effects of using old gasoline in your lawnmower can range from minor inconveniences to major problems.
Difficulty Starting and Poor Performance
The most noticeable sign of old gas is difficulty starting. The clogged fuel system can prevent the engine from receiving the necessary fuel for ignition. Once running, the mower may exhibit poor performance, sputtering, and a lack of power.
Engine Damage: A Worst-Case Scenario
In severe cases, old gasoline can lead to serious engine damage. Gum and varnish deposits can build up in critical engine components, causing wear and tear, seizing, and even permanent damage. This can result in expensive repairs or even the need for a new engine.
How to Avoid the Problems: Tips for Fuel Management
The best way to protect your lawnmower from the detrimental effects of old gas is to practice good fuel management. Here are some tips:
1. Use Fresh Gas
Always use fresh gasoline in your mower. The American Petroleum Institute (API) recommends using gasoline that is no more than 30 days old.
2. Store Fuel Properly
If you’re not using your mower for extended periods, store gasoline in sealed containers in a cool, dry location. Consider adding a fuel stabilizer, which helps prevent oxidation and extends the shelf life of gasoline.
3. Empty the Tank Before Storage
Before storing your mower, empty the fuel tank to minimize the amount of gasoline that is exposed to air and susceptible to degradation.
What if You Already Have Old Gas?
If you find yourself with a tank of old gas, there are a few options:
1. Use it Up Quickly
If the gas is relatively fresh (less than a month old), you can try using it up quickly. However, this is only advisable for short-term use.
2. Add Fuel Stabilizer
If the gas is a bit older, you can add a fuel stabilizer to help break down the gum and varnish deposits. Allow the mixture to sit for a few hours before running your mower.
3. Dispose Properly
If the gas is significantly old or you’re unsure about its condition, the safest option is to dispose of it properly. Never pour old gas down the drain or into the ground. Check with your local waste management facility for disposal guidelines.
Conclusion: Keep Your Mower Healthy with Fresh Fuel
While a few sips of old gas may not cause immediate damage, it’s best to avoid it altogether. By prioritizing fresh fuel and practicing good fuel management, you can ensure your lawnmower runs smoothly and lasts for many seasons to come. Remember, a little preventative care can save you a lot of headaches (and repair bills) in the long run.
Frequently Asked Questions
Q1: What happens to gasoline over time?
Gasoline is a volatile mixture of hydrocarbons. When exposed to air, it oxidizes and breaks down into various byproducts. These byproducts include gum, varnish, and other deposits that can clog the fuel system of your lawnmower. This process is known as “going stale.” The rate at which gasoline goes stale depends on several factors, including the type of gasoline, the storage conditions, and the presence of stabilizers.
Generally, gasoline can remain usable for up to 30 days if stored properly in a sealed container. However, it’s best to avoid using gasoline that’s more than a month old.
Q2: How can I tell if my gas is bad?
There are a few signs that your gasoline is going bad. It might have a darker color, a different smell, or a cloudy appearance. Additionally, you might notice that your lawnmower is having trouble starting or running. This is because the stale gasoline is gumming up the fuel system.
Q3: Can I use a fuel stabilizer to prevent this from happening?
Yes, using a fuel stabilizer can help to prevent gasoline from going bad. Fuel stabilizers are additives that slow down the oxidation process. They are available at most hardware stores and auto parts stores.
Q4: Can I just drain the old gas and add fresh gas?
Yes, draining the old gas and adding fresh gas is the best way to fix a lawnmower that has been sitting with stale gasoline. You should also try to clean the fuel system to remove any deposits that have formed.
Q5: What should I do if my lawnmower won’t start after using old gas?
If your lawnmower won’t start after using old gas, you should first try to drain the old gasoline and add fresh gasoline. If that doesn’t work, you may need to clean the fuel system. You can do this yourself, or you can take your lawnmower to a mechanic.
Q6: Is it better to store a lawnmower with a full or empty tank?
It’s best to store a lawnmower with a full tank of gasoline if you are going to store it for a long time. This is because a full tank will minimize the amount of air that is in the tank, which will slow down the oxidation process. However, it’s best to store a lawnmower with an empty tank if you are only going to store it for a short time. This will help to prevent the gasoline from going stale.
Q7: Should I use ethanol-free gasoline in my lawnmower?
Ethanol-free gasoline is a good option for lawnmowers because it doesn’t contain ethanol, which can attract moisture and lead to the formation of deposits in the fuel system. Ethanol-free gasoline is typically available at marinas and airports.