Katerina Swanson
Gasoline evaporation is a common issue in chainsaw fuel tanks, with many users reporting the problem in online forums. While some people opt to empty their chainsaw fuel tanks and run them dry before storage, others prefer to keep their tanks full. Those who choose to store their chainsaws with fuel often use premixed, shelf-stable fuel like Srihl Motomix, Echo Redarmor, or VP. However, it's important to note that ethanol fuel without a stabilizer can evaporate over time, causing water to enter the tank and potentially damaging the machine. Additionally, users have reported issues with old gasoline, which can cause the machine to run less efficiently. To prevent these issues, some recommend using fuel stabilizers or ethanol-free gas. Regular maintenance, such as cleaning the spark arrestor and changing the air filter, can also help ensure the proper functioning of the chainsaw.
| Characteristics | Values |
|---|---|
| Will gasoline evaporate in a chainsaw fuel tank? | Yes, gasoline will evaporate over a couple of months, leaving a richer mix in the tank. |
| How to prevent evaporation? | Use a fuel stabilizer, ethanol-free gas, or a pre-mix fuel. |
| How to store chainsaws with fuel? | Opinions vary, some people store chainsaws with empty tanks, while others fill the tank with fuel and store under shelter. |
| How often should fuel be replaced? | Fuel is likely fine for a couple of years if it is ethanol-free. |
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What You'll Learn
Gasoline can evaporate from a chainsaw fuel tank
Some people recommend storing chainsaws with a full tank of fuel, while others prefer to empty the tank before storage. Those who choose to store their chainsaws with fuel in the tank often use a premixed, shelf-stable fuel such as Srihl Motomix, Echo Redarmor, or VP. Storing a chainsaw with ethanol fuel can cause damage as it may introduce water into the tank and machine.
To prevent issues with evaporation, some people recommend using ethanol-free gas or adding a fuel stabilizer to the tank. Another suggestion is to start the chainsaw every few weeks and run it for a couple of minutes to keep things lubricated and prevent drying out.
It is important to note that while gasoline can evaporate from a chainsaw fuel tank, it may not happen quickly, especially if the tank is properly sealed. However, it is always a good idea to take preventive measures to maintain the chainsaw's performance and longevity.
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Evaporation can cause water to enter the tank
Gasoline will evaporate from a chainsaw fuel tank, and this process begins as soon as the gas is pumped into the tank. Over a couple of months, the gas will evaporate, but it is highly unlikely that it would do so in a week or two. The evaporation process is sped up when the gasoline is mixed with oil, as is the case with chainsaw fuel. This is because oil loses its viscosity over time, and this process is accelerated by frequent changes in moisture and temperature levels.
Ethanol-based fuels are also known to evaporate and introduce water into the tank and machine, which can cause serious damage. This is because ethanol attracts moisture, which can cause the oil and gas premix to degrade more rapidly, leading to performance issues and engine problems. Therefore, it is recommended to use fuel with an ethanol level lower than 10%.
To prevent evaporation and water entry, some recommend filling the tank with high-quality ethanol-free gas and running the chainsaw briefly to ensure the fuel gets into the engine. This method ensures that things do not dry out. Additionally, it is advised to start the chainsaw every few weeks and run it for a couple of minutes.
Another way to prevent issues caused by evaporation is to use a premixed, shelf-stable fuel designed for two-stroke engines. These premixed formulas contain ingredients that help the chainsaw last longer and run smoothly. It is also important to note that the chainsaw's fuel should be stored in a suitable watertight container to prevent degradation.
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Evaporation is more likely in ethanol fuel
Gasoline can evaporate from a chainsaw fuel tank, but it would take a long time. This is because the fuel tank is vented, so gasoline can evaporate or moisture can enter the tank. However, it is more likely that gasoline has leaked from the tank or been used up.
Ethanol fuel is also known to evaporate over time, and this can cause problems in chainsaws. If left in the tank, ethanol can introduce water into the tank and machine, which can cause serious damage. It can also damage or erode the fuel line in older chainsaws. To prevent this, a stabilizer should be added to the ethanol fuel.
Tests have shown that ethanol-blended gasoline (E10) lost more weight to evaporation than the base gasoline. However, the increased weight loss was due to the ethanol in the E10 fuel, which evaporated at concentrations of about 13 weight percent. This means that the E10 fuel lost about 5% less gasoline than the base fuel.
In low-temperature conditions, ethanol evaporates more slowly than gasoline. However, at higher temperatures, more ethanol evaporates as it has a lower stoichiometric air/fuel ratio and heating value. This means that more ethanol must be injected into the cylinder to maintain the same output power, which results in a larger spray momentum and longer spray tip penetration.
Overall, while gasoline can evaporate from a chainsaw fuel tank, it is a slow process and is less likely to occur than other issues such as leaks or fuel usage. Ethanol fuel is more likely to evaporate and can cause damage to the chainsaw if left in the tank for extended periods.
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Fuel stabilizers can be used to prevent evaporation
Gasoline will evaporate from a chainsaw fuel tank over time, and this can cause serious damage to the chainsaw. Fuel stabilizers can be used to prevent this evaporation and the damage it causes.
Fuel stabilizers are designed to maintain the quality of stored fuel. They can be used in all kinds of gasoline and diesel engines, including two-stroke motors found in chainsaws. They are particularly useful if the chainsaw will be stored for 30 days or more. The optimal time to add a fuel stabilizer is when filling up the tank, and it is important to follow the product instructions on the brand of stabilizer purchased. Typically, users should ensure the tank is almost empty, add the correct amount of stabilizer, and then top off the tank with fuel. The engine should then be run for 5-10 minutes to allow the stabilizer to reach the entire fuel system.
There are many benefits to using a fuel stabilizer. Firstly, they prevent evaporation, which in turn prevents the introduction of water into the tank and machine. Water in the system can cause serious damage. Secondly, stabilizers prevent the formation of gum and varnish, which can cause engine problems and reduce fuel efficiency. Gummy deposits can also lead to extensive and expensive repairs if left for long periods.
Some fuel stabilizers are formulated to be used only with gasoline or diesel fuel, while others are dual purpose. Berryman Total Fuel Stabilizer, for example, is compatible with all 2-stroke and 4-stroke engines and can be used with all grades of gasoline and diesel fuel. It contains corrosion inhibitors, metal deactivators, and antioxidants to prevent rust and oxidation.
Fuel stabilizers are a great way to preserve the fuel in your chainsaw's tank and keep the motor running smoothly.
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Running a chainsaw dry before storage can prevent issues
Gasoline can evaporate from a chainsaw fuel tank, although this would usually take a long time. However, if the fuel contains ethanol, it can evaporate over time and introduce water into the tank, which can cause serious damage. It can also erode the fuel line in older saws.
To prevent issues, it is recommended to run a chainsaw dry before storage. This is because, over time, gasoline will evaporate, leaving a richer mix in the tank, which can cause problems when attempting to run the chainsaw again. Running the tank dry and then disposing of any remaining fuel can prevent this issue.
After running the tank dry, it is important to clean the chainsaw before storage. This includes cleaning the cylinder ribs and air filter. It is also recommended to remove the saw chain and guide bar, clean them, and spray them with protective oil. The whole chainsaw should be stored in a dry, secure location, out of direct sunlight, and locked away, especially if children are around.
For medium-term storage, a fuel stabilizer can be used to protect the chainsaw when the tank is drained. This will keep the fuel in the chainsaw tank for up to two years. However, for long-term storage, the fuel must be drained and the chainsaw cleaned.
Some people recommend using a non-ethanol fuel, such as Stihl pre-mix fuel, and running a little through the chainsaw before storage. This can help prevent issues caused by ethanol fuel.
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Frequently asked questions
Yes, gasoline will evaporate over a couple of months, leaving a richer mix in the tank.
To prevent gasoline from evaporating, use a fuel stabilizer or fill the tank with high-quality ethanol-free gas.
Using old gasoline in your chainsaw is generally fine, especially if it is ethanol-free, but it may result in reduced power.
