Rajan Wilcox
Gas-powered tree trimmers typically have two fuel lines: a feed line and a return line. The feed line supplies fuel to the carburetor, while the return line allows unused fuel to flow back into the fuel tank. Some models may also have a vent line to release pressure and prevent fuel leakage. When replacing or repairing fuel lines, it is important to ensure that the tubes are cut to the proper length and inserted securely into the gas tank. This can sometimes be a tricky process, and users may need to enlarge the holes in the gas tank or use lubricants to ease insertion.
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What You'll Learn
Fuel line length
The fuel line length and setup for a gas tree trimmer depend on the make and model of the trimmer. For example, the Echo GT200R string trimmer has three fuel lines: a feed line, a vent line, and a return line. The feed line is positioned so that the fuel filter is at the back of the tank, while the vent and return lines extend about three inches into the tank.
Some trimmers may have different fuel line configurations, and it is important to refer to the specific instructions for your trimmer model. When installing fuel lines, it is crucial to ensure a tight fit to prevent fuel leakage. The fuel line should be the proper size and securely threaded through the gas tank.
In some cases, fuel-resistant grommets can be used to secure the fuel lines and prevent leakage. However, it is recommended to use them only if necessary, as they may cause issues when the fuel line shrinks. Instead, opting for thicker fuel tubing can be a more effective solution.
When replacing fuel lines, it is important to choose the correct size and type of fuel line for your trimmer. Using a fuel line kit specific to your trimmer model can make the installation process easier. Additionally, it is worth noting that certain materials, such as SAE 30R7 hoses, are designed for fuel and are suitable for low-pressure applications.
Overall, the fuel line length and setup can vary among different gas tree trimmer models. It is essential to refer to the specific instructions and ensure proper installation to prevent fuel leakage and maintain the optimal performance of your trimmer.
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Fuel line size
The fuel line size for a gas tree trimmer is an important consideration, as it can impact the performance and safety of the machine. Most gas tree trimmers have three fuel lines: a feed line, a vent line, and a return line. These lines are typically made of plastic or rubber and must be the correct size to fit securely in the gas tank.
The proper size of the fuel line is critical to ensure a tight fit and prevent leakage. The fuel line should be just large enough to fit through the holes in the gas tank, with a bit of resistance. If the line is too small, it may not seal properly and allow fuel to leak out. On the other hand, if the line is too large, it may be difficult to thread through the holes and could damage the tank.
There are a variety of fuel line sizes available on the market. The most common size mentioned in forums is 3/32" ID (inner diameter) x 3/16" OD (outer diameter). This size is typically used for fuel lines that need to fit through smaller holes. For larger holes, a fuel line with a larger OD may be necessary, such as 1/4" OD or 5/16" OD.
It's important to note that the fuel line size may vary depending on the make and model of the gas tree trimmer. Some machines may require two different sizes of fuel lines, with the same ID but different ODs. It's always best to consult the manufacturer's instructions or a qualified technician to determine the correct fuel line size for your specific trimmer.
In addition to the size, the material of the fuel line is also important. The fuel line should be made of a material that is resistant to gasoline and other chemicals. Some common materials used for fuel lines include plastic, rubber, and Viton®. Plastic fuel lines, such as SAE 30R7 hoses, are flexible and commonly used for low-pressure applications. Viton®, on the other hand, is known for its exceptional resistance to petroleum-based fuels and other hydrocarbons, making it a popular choice for engineers.
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Fuel line material
Gas-powered tree trimmers typically have three fuel lines: a feed line, a vent line, and a return line. The fuel lines are usually made of plastic, and sometimes the fuel tank will also have fuel-resistant grommets.
When it comes to choosing a fuel line material, there are a few options. Some trimmers use OEM (Original Equipment Manufacturer) parts, which are designed to be the best fit for the machine. Other options include Tygon tubing, which is available in hobby shops and online, and Viton tubing, which is known for its resistance to oils, chemicals, and high temperatures.
It is important to ensure that the fuel lines are the correct size for the trimmer. If the lines are too small, they may leak, and if they are too large, they may not seal properly. Some sources suggest that the proper size fuel line should be a very tight fit, with the ID (inner diameter) and OD (outer diameter) differing by 1/32" or 3/32".
In terms of sealing the fuel lines, some people recommend using a sealant or adhesive that can withstand long-term exposure to gasoline. However, others caution against this, as the wrong sealant can make a mess that is difficult to clean up. One suggestion is to use fuel-resistant grommets, which can help create a tight seal and prevent leaks.
Overall, when selecting a fuel line material for a gas tree trimmer, it is important to consider the compatibility, durability, and safety of the material to ensure optimal performance and prevent leaks.
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Fuel tank sealant
Gas-powered tree trimmers typically have three tubes in the fuel tank: feed, vent, and return. The feed line extends to the back of the tank, while the vent and return lines go about three inches into the tank.
If you are experiencing fuel leaks, there are several methods to seal the fuel tank of your gas tree trimmer. One option is to use a fuel-resistant grommet, which can be moulded into the tank line. Another option is to use a suitable sealant or adhesive that can withstand long-term exposure to gasoline. However, it is challenging to find an adhesive that will hold up over time. Some sources suggest using a soldering iron for plastic welding, while others recommend specific products like JB weld, Permatex high-heat gasket maker, or proseal, a two-part sealer used in aircraft maintenance. It is important to ensure proper ventilation when working with these products.
When selecting a sealant, consider the material of your fuel tank. For plastic tanks, one suggestion is to use acetone to dissolve plastic shavings from under the handle, creating a thick slurry that can act as glue. Another option is to use a wicking viscosity of super glue, which is highly resistant to gasoline and ethanol.
Before applying any sealant, ensure that you have the correct fuel line size. Most machines require two different sizes, and it is more cost-effective to replace the fuel line with the proper size rather than relying solely on a sealant.
Additionally, some users have shared their experiences with different sealants. One user recommended plastic welding with a soldering iron for a more robust fix, while another suggested JB weld as a temporary solution. It is important to note that some sealants may not adhere well to plastic tanks, and proper surface preparation is crucial for effective sealing.
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Fuel line grommets
When installing fuel lines, it is crucial to ensure they fit snugly and securely. Some users have reported that their fuel lines were a "tightish fit" but still allowed a small amount of gas to leak through the opening when the trimmer was held at an angle. This issue may worsen over time as the fuel line shrinks, causing further leakage.
To prevent leakage, it is recommended to use fuel-resistant grommets, which can either be moulded into the tank lines or installed separately. These grommets provide a tight seal around the fuel lines, preventing fuel from escaping. It is worth noting that fuel line grommets should only be installed if absolutely necessary, as they can be challenging to work with.
When selecting a fuel line, it is important to choose the proper size to ensure a secure fit. The fuel line should be a very tight fit, with the correct diameter to match the fuel tank holes. In some cases, the holes in the gas tank may need to be enlarged to accommodate the fuel lines. Additionally, the length of the fuel lines is important, especially for the main line, which should be long enough to reach the fuel regardless of the machine's orientation.
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Frequently asked questions
Most gas tree trimmers have two fuel lines – a feed line and a return line.
The feed line is the tube that feeds fuel into the carburetor.
The return line allows unused fuel to flow back into the gas tank.
The fuel lines are typically made of clear plastic tubing.
The feed line should be long enough to reach the fuel regardless of how you hold the machine. The return line should go about three inches into the tank.
