Prolonged operation at WOT can even cause damage to the engine components along with the guide bar and chain. The heat generated is enough to boil the gasoline, thus causing a vapor lock. I would never recommend you to run your saw at WOT for more than a short period. Running your chainsaw at wide-open throttle (WOT) overheats it excessively. To save yourself from the trouble of fixing them over and over, here are some tips and tricks that can help you prevent chainsaw vapor locks. Vapor locks can be quite frustrating if you have work to finish. Ensure you always let the engine idle before shutting it off. To prevent your chainsaw from vapor locking, avoid running it lean or overheating it. Also, avoid adjusting your carburetor to a lean setting, which causes overheating and further aggravates the vapor-locking effect. This can also unnecessarily increase your device’s fuel consumption. I wouldn’t recommend this, as after the vapor lock is fixed, your engine will run a lot richer and may experience difficulty while running. They do so to enrich the mixture with more fuel, which was restricted due to the vapor lock. Some users turn the choke on and set their carburetor to a rich setting when they encounter a vapor lock. This will further help cool down the vapors and fix the vapor lock. To speed up the process, you can pour cold water on the carburetor and the engine area. This may be more time-consuming if you want to start quickly. To do this, you can stop your engine and let it sit for a while. The safest way is to ensure these vapors cool down and condense within the fuel lines. Furthermore, if these vapors are hot enough, they may cause burns to your skin. It can be risky to let highly pressurized fuel vapors escape into the atmosphere as they tend to ignite and start a fire, particularly in a closed environment. This method, however, is certainly not the safest. This can be done by opening your fuel tank’s cover and letting all the vapors escape.Īs the vapor pressure falls, the fuel flow will ease down, and the engine will start as a result. The quickest way of removing these vapors is to allow them to escape back into the atmosphere. These vapors exert an additional back pressure, thus hindering the fuel flow to the engine. Fastest Way:Īs discussed earlier, fuel vapors are trapped in the carburetor and fuel lines. However, the safest way of fixing this is to allow your chainsaw to cool for some time before starting it again. One way to fix a vapor lock is to open the fuel tank’s cover and allow the vapors to escape the fuel lines. This would confirm that your engine has indeed developed a vapor lock. If, in this case, you shut the engine off and restart it without checking the fuel tank, it will not start again. As it begins to heat up, it might show signs of bogging down and feel like the fuel has run out. If you experience that your overheated chainsaw doesn’t start up, check your tank vents for any clogging.Īlso, in the case of vapor lock, the chainsaw starts just fine when it is cold and runs perfectly too. Hence the vapor pressure doesn’t escalate too much to trigger a vapor lock. Usually, all fuel tanks have vents to allow the escape of fuel vapors into the atmosphere. The engine, as a result, starves from fuel, and hence it may not start again after it has been shut down after a heated operation. This heating effect worsens when the saw is run at wide-open throttle (WOT) or when the carburetor is adjusted to a lean setting.Īs the vapor pressure builds up, the carburetor faces difficulty extracting gasoline through the fuel lines due to the backpressure created by the vapors. As a chainsaw heats up, the vapor pressure in the fuel lines increases. Vapor lock is a condition when gasoline vaporizes excessively in the fuel tank and the fuel lines. Sometimes, it wouldn’t start up after turning the engine off. If your chainsaw engine has a vapor lock, it will start perfectly, but as it heats up, it will act as if it’s run out of fuel. How do I Know if a Chainsaw Engine has a Vapor Lock?
3 How do you Stop a Chainsaw Vapor Lock?.2 How do you Fix a Chainsaw Vapor Lock?.1 How do I Know if a Chainsaw Engine has a Vapor Lock?.
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