It causes big problems – this is what happens if you leave gas in a snow blower over the summer. The fuel breaks down, gums up the engine, and makes starting it a nightmare when winter comes back.
I see this mistake all the time. People put their snow blower away in spring and forget about the tank. They think it will be fine sitting there for months.
But gas isn’t like water. It doesn’t just sit there doing nothing. It starts to change and go bad inside your machine.
I’ve fixed many snow blowers with this exact issue. Let me walk you through what goes wrong and how you can stop it.
What Exactly Happens to Old Gas?
Here’s the deal with gasoline. It’s not a stable liquid for long-term storage. It begins to break down after just 30 days.
The lighter parts of the gas evaporate first. This leaves behind a thicker, gunkier fuel. This gunk is what clogs everything up.
Ethanol in modern gas makes this worse. It attracts water from the air like a sponge. This water then sits in your fuel system.
When you leave gas in a snow blower, this process happens slowly all summer. By fall, the fuel is often useless. It might even smell sour or varnish-like.
This bad fuel can’t burn right in the engine. It leads to poor performance or a complete no-start condition. You’ll be pulling that starter cord forever.
The Real Damage to Your Engine
So what happens if you leave gas in a snow blower for the engine itself? The damage goes deeper than just bad fuel.
The gummy residue coats the inside of the carburetor. This small part mixes air and fuel for the engine. When it’s gummed up, the engine can’t run.
Jets and passages inside the carburetor get blocked. These are tiny holes that fuel must flow through. Even a little gunk can plug them shut.
Fuel lines and the fuel filter can also get clogged. This stops gas from reaching the engine at all. You might have a full tank but an empty carburetor.
Water in the fuel causes rust inside the tank and fuel system. Rust particles then travel into the carburetor. They cause more blockages and wear.
In bad cases, you might need a whole new carburetor. This is a costly repair that’s totally avoidable. A simple fuel treatment could have saved it.
How Long Before Problems Start?
You might wonder about the timeline. How long does it take for gas to go bad in your machine?
Modern fuel with ethanol starts to degrade in about one month. You can notice performance issues after just one season of sitting.
If you leave gas in a snow blower over one summer, you’ll likely have starting problems. The engine might sputter and die or refuse to start at all.
Leave it for two summers and the damage is often severe. The fuel turns to a thick varnish. It can completely seize small engine parts.
I’ve seen snow blowers that sat for three years with old gas. Their carburetors were solid blocks of gunk. The fuel tanks were rusty inside.
The US Forest Service notes that fuel stability is key for outdoor power equipment. Proper storage prevents most issues.
Time is not your friend here. The longer the gas sits, the worse the problems get. Don’t take the chance.
Spotting the Signs of Bad Gas
How can you tell if you have a problem? Look for these clear signs when you try to start your blower.
The engine won’t start at all is the biggest clue. You pull and pull the cord but nothing happens. The spark plug might be wet with fuel that won’t ignite.
It starts but then dies quickly is another common sign. The engine runs for a few seconds then sputters out. This often means the carburetor jets are partly blocked.
Rough running and lack of power point to fuel issues too. The engine sounds uneven and can’t reach full speed. It bogs down when you try to blow heavy snow.
Check the fuel itself. Drain a little into a clear container. Good gas is clear and smells like, well, gasoline.
Bad gas often looks darker. It might have a cloudy appearance from water. The smell can be sour or like paint thinner.
If you see any of these signs, you likely left gas in your snow blower too long. It’s time for a fuel system clean-out before winter hits.
The Step-by-Step Fix for Old Gas
Don’t panic if you made this mistake. You can often fix it yourself with some simple steps. Here’s what I do.
First, drain all the old fuel from the tank. Use a siphon pump or tilt the machine carefully. Get every last drop out that you can.
Next, remove the carburetor bowl if your model has one. This is a small cup on the bottom of the carburetor. It often holds the worst of the gunk.
Clean the bowl and the inside of the carburetor with carburetor cleaner spray. This stuff breaks down the varnish. You can find it at any auto parts store.
Replace the fuel filter if your blower has one. It’s a small, cheap part that gets clogged easily. Always use a new one after bad fuel.
Add fresh, stabilized gasoline to the tank. Use fuel with no ethanol if you can find it. It lasts much longer in storage.
According to the Environmental Protection Agency, proper small engine care reduces emissions. A clean engine runs cleaner and better.
Try starting the engine. It might take a few pulls to get the fresh fuel through the system. If it still won’t start, the carburetor might need a deeper clean or replacement.
How to Store Your Snow Blower Correctly
Prevention is way easier than the fix. Here’s how to store your machine so this never happens to you.
At the end of the season, run the engine until it stops from lack of fuel. This empties the carburetor and fuel lines. It’s the best method for most people.
Or, you can add a fuel stabilizer to fresh gas. Run the engine for a few minutes to get it through the system. Then shut off the fuel valve and let it sit.
Stabilizer treats the gas so it won’t break down as fast. It can keep fuel good for up to two years. This is great if you forget things easily.
Store your snow blower in a dry, covered place. A garage or shed is perfect. Keep it away from damp areas that promote rust.
The CDC NIOSH recommends safe storage of fuel and equipment. It prevents fires and keeps your gear ready to use.
Do a quick check in the fall before the first snow. Make sure everything still looks good. A little prep saves a lot of frustration later.
Common Mistakes People Make
I see the same errors over and over. Avoid these to keep your snow blower happy.
Using regular pump gas without stabilizer is mistake number one. Today’s fuel just doesn’t last. It’s made to burn now, not sit for months.
Thinking “just one season won’t hurt” is another big error. It often does hurt. One summer of bad gas can ruin your next winter.
Storing the blower with a full tank of untreated gas is asking for trouble. A full tank has more fuel to go bad and cause issues.
Not running the engine dry before storage leaves fuel in the carburetor. This small amount can still gum up the works. It’s the most critical part to empty.
Forgetting to change the oil before storage is another oversight. Old oil has acids that can damage engine parts over time. Fresh oil protects during the off-season.
If you leave gas in a snow blower, you’re making the top mistake on this list. It’s the root cause of most starting problems I see.
Benefits of Proper Fuel Management
Taking a few minutes to do it right pays off big time. Here’s what you gain.
Your snow blower starts on the first or second pull every time. No more yanking your arm out in the cold. That’s a huge win on a snowy morning.
You save money on repairs and parts. Carburetors aren’t cheap. Your time has value too, and fixing this eats up a lot of it.
The engine runs smoother and has more power. Good fuel equals good performance. You’ll clear your driveway faster with less effort.
Your machine lasts many more years. Small engines die from neglect, not use. Proper care can double the life of your snow blower.
You avoid the stress and panic when a storm hits. Knowing your equipment will work is peace of mind. You can focus on staying warm instead of fixing things.
The U.S. Department of Energy states that well-maintained equipment operates more efficiently. This saves fuel and reduces waste over time.
It’s a simple habit that makes winter easier. A tiny bit of spring work prevents a giant fall headache.
What About Fuel Additives and Stabilizers?
Are these products worth it? In my experience, yes, they really help.
Fuel stabilizer is the most important one. It slows down the chemical breakdown of gasoline. It also helps prevent moisture buildup in the tank.
Use it every time you store your snow blower for more than a month. Just add it to fresh gas, run the engine, and you’re set. Follow the directions on the bottle.
Ethanol treatment is another good option if you can’t find ethanol-free gas. It counteracts some of the bad effects of ethanol. It reduces water attraction and phase separation.
Carburetor cleaner in a spray can is for fixing problems, not preventing them. Keep one on hand for quick clean-outs of external parts.
Don’t use too many additives at once. Sometimes they can work against each other. Pick a good stabilizer and stick with it.
Remember, additives help but they aren’t magic. If you leave gas in a snow blower for five years, even treated fuel might cause issues. They extend life, not make it infinite.
Frequently Asked Questions
What happens if you leave gas in a snow blower over summer?
The gas breaks down and turns to gunk. It clogs the carburetor and fuel lines. Your snow blower likely won’t start when you need it.
How long can gas sit in a snow blower before it goes bad?
Gas with ethanol starts to degrade in about 30 days. After one full season of sitting, it’s often too bad to use. Always use stabilizer for storage.
Can I use old gas if I mix it with new gas?
I don’t recommend it. The old gas can still contaminate the new fuel. It’s better to drain the old stuff completely and start fresh.
What happens if you leave gas in a snow blower with stabilizer?
Stabilizer helps a lot. It can keep fuel good for up to 24 months. But you should still run the engine dry or use fresh treated gas each season for best results.
Is it bad to store a snow blower with an empty tank?
An empty tank is actually good for long storage. It prevents fuel from going bad inside. Just make sure to run the engine dry so the carbure
