Why Your Chainsaw May Cut Out When Throttle is Applied Troubleshooting Tips

Why Your Chainsaw May Cut Out When Throttle is Applied: Troubleshooting Tips

Are you frustrated with your chainsaw losing power or stalling when you need it the most? Do you wonder what could be causing your engine to sputter or stop running when you push the throttle all the way down? Fear not, for there are several reasons why a chainsaw may cut out at wide-open throttle (WOT), and most of them can be fixed without professional help.

In this chainsaw troubleshoot article, we will explore some of the common issues that can affect your chainsaw’s performance and provide you with some tips on how to troubleshoot them effectively. Let’s dive in!

Clogged Fuel Filter: Symptoms, Causes, and Solutions

One of the main culprits behind a chainsaw that stalls at full throttle is a clogged fuel filter. As the name implies, what a fuel filter does is filter the gasoline as it flows from the fuel tank to the carburetor, removing impurities and debris that could clog the carburetor or damage the engine.

Chainsaw Clogged Fuel Filter: Symptoms, Causes, and Solutions

Over time, the fuel filter itself can become clogged with dirt, rust, or other contaminants, reducing the flow of gasoline to the carburetor and causing the engine to run lean, rough, or stall.

  • Symptoms: If your chainsaw idles fine but cuts out or bogs down when you apply the throttle, or if it runs fine at low RPMs but dies when you rev it up, chances are your fuel filter may be clogged. Another symptom of a clogged fuel filter is a chainsaw that starts and runs for a few seconds but then stops abruptly, as if it runs out of gas.
  • Causes: There are several reasons why a fuel filter can become clogged, including poor gasoline quality, old or contaminated fuel, water or condensation in the fuel tank, or a faulty filter itself. Using old or stale gasoline, storing the chainsaw for extended periods without draining the fuel tank, or not using a fuel stabilizer can increase the likelihood of clogging.
  • Solutions: To check if your fuel filter is clogged, remove the fuel cap, pour some gasoline into a separate container, and use a thin metal rod to fish out the filter from the tank. If the filter appears dirty, discolored, or clogged, replace it with a new one, following the manufacturer’s instructions. If the filter looks clean, it may not be the cause of the problem, and you should inspect other potential causes, such as the fuel lines or carburetor. Also, make sure the filter is properly seated and not loose, as a loose filter can cause the engine to stall.

Restricted Fuel Lines: Causes, Symptoms, and Fixes

Another reason why your chainsaw may cut out when you apply the throttle is a restriction in the fuel lines. Fuel lines are the tubes that carry the gasoline from the fuel tank to the carburetor, and they need to be free of debris, kinks, cracks, and leaks to allow the proper amount of fuel to flow into the engine.

Chainsaw Restricted Fuel Lines: Causes, Symptoms, and Fixes

A fuel line that is clogged, damaged, or leaking can disrupt the fuel flow, causing the engine to run erratically or stall.

  • Causes: There are several causes of restricted fuel lines, including using old or contaminated fuel, leaving the chainsaw unused for extended periods, storing the chainsaw in a humid or wet environment, or using the wrong type of fuel lines. Fuel lines made of rubber or plastic can deteriorate over time, crack, or become loose, allowing air to enter the fuel system and disrupt the fuel flow.
  • Symptoms: Some of the symptoms of restricted fuel lines include a chainsaw that idles fine but stalls when you apply the throttle, a chainsaw that runs for a few minutes and then stalls, or a chainsaw that starts and runs for a short period before shutting off. These symptoms can be frustrating, but they are also an indication that there is an issue with the fuel lines.
  • Solution 2: Read the workshop manual on this website, check out the trouble shooting guide or seek professional help.

If all the above-mentioned solutions fail to resolve the issue, it might be time to seek professional help. A professional can better diagnose the problem and provide you with a viable solution. This might be the best option if you are unsure of what the problem is or how to fix it.


A chainsaw is an essential tool for any homeowner or professional woodcutter. Like any other tool, it requires maintenance to ensure it performs optimally. A chainsaw stalling when throttle is applied can be a frustrating experience. It can be caused by a clogged fuel filter, restricted fuel lines, dirty air filter, or a clogged carburetor. Regular maintenance of the chainsaw is crucial to keep it running smoothly.


In short, checking the fuel filter, fuel lines, air filter, and carburetor on a regular basis can help keep your chainsaw from stalling. Make sure you always use the recommended type of fuel and oil, and store the chainsaw correctly when not in use. Always wear protective gear and follow safety precautions when using the chainsaw.

If you have tried all the solutions mentioned above and the chainsaw still stalls when throttle is applied, it might be time to seek professional help. Don’t wait until it’s too late, get your chainsaw checked as soon as you notice any issues.

There are free manuals to view online or download on this website to help you with any repairs to your chainsaw.


  1. Ted Baker

    I can understand the frustration that comes with having a chainsaw cut out on you just when you need it the most. It can be a real pain in the neck, especially if you’re in the middle of a big job.

    For instance, last summer I was clearing some trees on my ranch, and my chainsaw kept stalling every time I tried to rev it up. I was getting pretty worked up, to say the least. But after reading through some troubleshooting tips, I was able to get it back up and running in no time.

    So if you’re dealing with a chainsaw that keeps cutting out when you hit the throttle, don’t worry!

  2. Terry

    I had the same problem with my chainsaw, and it turned out to be stale fuel that had been kept for too long. This article helped me quickly identify the issue, and I was able to get my chainsaw back up and running in no time. Thanks!

  3. Barry

    A friend of mine was using his chainsaw to cut down a tree when he noticed that the engine would cut out every time he tried to increase the throttle. After some troubleshooting, he realized that the fuel filter was clogged with debris from the tree he was cutting. This restricted the flow of fuel to the carburetor, causing the engine to stall when he tried to increase the throttle.

    Once he cleaned or replaced the fuel filter, the chainsaw worked properly again. This experience taught him the importance of regularly checking and maintaining his chainsaw’s fuel system components to avoid similar issues in the future.

  4. Kelly

    just what I was looking for…useful tips and help for my chainsaw problems

  5. William

    This came in handy as been having trouble starting my chainsaw lately

  6. Ernest

    The fuel line 0n my old husky chainsaw was clogged from stale fuel deposits, I had to thoroughly clean it out, and now it works great!

  7. Mark Gilmour

    My comment is a huge thumbs up compliment to CWM Manuals. You folks have made my life so much easier. A total success, each and every time i visit. None better. Thank You.

Leave a Reply

Your email address will not be published. Required fields are marked *

Works On Any Device

Customer Help

Check email for validation link

No purchase necessary

error: Content is protected !!