
If your chainsaw isn't working, it could be due to a clogged or cracked fuel line. Chainsaw fuel lines are typically clear plastic tubes that feed fuel into the carburetor and allow unused fuel to flow back into the tank. Replacing the fuel line is a straightforward task but can be tricky at times. Before inserting the new tubing, cut the tip of the fuel line at a diagonal angle to allow for easier insertion and fuel flow. You can also lubricate the fuel line with a drop of oil or WD-40 to aid in ease of entry. Once the new line is inserted, pull it through with hemostats, cut off the angle, and install a filter. Finally, pull the line back in so the filter rests on the bottom of the tank, trim the fuel lines, and connect them to the carburetor.
Characteristics and Values Table
| Characteristics | Values |
|---|---|
| Chainsaw fuel line replacement | Difficult, but straightforward task |
| Chainsaw fuel line material | Clear plastic tubing |
| Number of fuel lines in a chainsaw | Two |
| Fuel line insertion techniques | Use of lubricants, Stihl "string trick", diagonal cutting, use of hemostats, pliers, and wire |
| Fuel line issues | Clogging, cracking, disintegration |
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What You'll Learn

Using pliers to pull the fuel line through
When it comes to inserting fuel lines into a chainsaw, it can be a straightforward task, but sometimes it can be tricky. Chainsaw fuel lines are typically clear plastic tubing. Most chainsaws have two fuel lines – one that feeds fuel into the carburetor and a return tube that allows unused fuel to flow back into the chainsaw gas tank.
If you're using pliers to pull the fuel line through, here are some detailed steps to follow:
First, wear work gloves to protect your hands and ensure you are in a well-ventilated area. Remove the fuel cap and empty the fuel tank into an approved storage container. You can use an Allen wrench to remove the screws that hold the cylinder shield to the engine, and then lift off the shield.
Next, you can use needle-nose pliers to carefully grip the fuel line and begin pulling it through. Some pliers are specifically designed for this purpose, such as long-reach pliers or compound pliers. You can also use a screwdriver to work the fuel line in from the top. If the fuel line is difficult to grasp, try wrapping the hose around a smooth dowel rod for leverage.
As you pull the fuel line through, be mindful not to damage the tubing. Some people recommend using a string trick, where you take a ballpoint pen spring or something similar and stretch it over the fuel line, twisting it like a screw. This can help guide the fuel line into place without damaging it.
Once you've pulled the fuel line through, you can cut it to size and install a fuel filter. Push the line back into the tank so that the filter rests at the bottom. Finally, trim the fuel line and connect it to the carburetor, ensuring a proper fit.
By following these steps and using the right tools, you can successfully use pliers to pull the fuel line through when replacing or repairing the fuel lines in your chainsaw.
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Lubricating the fuel line with WD-40 or oil
Chainsaw fuel lines are typically made of clear plastic tubing. They can be challenging to feed into the plastic tank. Lubricating the fuel line with WD-40 or oil can make the process easier.
Before lubricating the fuel line, it is important to cut the tip of the fuel line that fits into the tank. This should be done at a diagonal angle, which will allow the fuel to feed into the tube more easily and aid in insertion.
When lubricating the fuel line with WD-40, it is important to note that while it can help with rust prevention and unsticking parts, it is not a substitute for a proper lubricant. If using WD-40, it is recommended to spray it onto a cloth and then wipe it on the surface of the bar and other metal hardware. This will help protect the metal from rust and corrosion.
If you are using oil as a lubricant, it is important to use the correct type of oil. Bar oil, also known as chain oil, is specifically designed for lubricating the chain of a chainsaw. It is important to avoid getting bar oil into the fuel tank, as it can cause issues with the engine. If bar oil is accidentally poured into the fuel tank, it is recommended to empty the oil and rinse the tank with straight gas or premixed fuel before starting the saw.
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Cutting the fuel line at an angle
When cutting the fuel line at an angle, it is important to use the proper tools. Needle-nose pliers can be used to remove the old tubes from the carburetor and pull them out of the tank. When removing the old fuel line, the small cylindrical fuel filter will come off. Hold the old tubing against the new tubing and cut the new tubes to match the length of the old ones. This ensures a proper fit.
There are also other tricks to help with the insertion of the fuel line. For example, some people recommend lubricating the new line with WD-40 or using a ""string trick". Additionally, you can try pushing a long standard width ty-wrap from the carburetor area, down into the tank, and out of the gas cap hole. Then, push the end of the fuel line over the ty-wrap end and use it to pull the line up through the tank opening.
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Using a Stihl string trick
The Stihl "string trick" is a classic method for inserting fuel lines into chainsaw tanks. Here is a step-by-step guide on how to perform the Stihl string trick:
Firstly, it is important to understand the components of a chainsaw's fuel system. Chainsaw fuel lines are typically clear plastic tubing, and most chainsaws have two fuel lines. One line feeds fuel into the carburetor, and the other is a return tube that allows unused fuel to flow back into the chainsaw's gas tank.
Before beginning the string trick, ensure you have the necessary tools and materials. You will need a replacement fuel line, a long standard width ty-wrap or similar string-like object, a lubricant such as WD-40, and a fuel filter.
Now, follow these steps:
- Lubricate the new fuel line with WD-40 or a similar lubricant. This will make it easier to insert the line into the tank.
- Attach the fuel filter to the end of the fuel line. This will ensure that the fuel line can be pulled through the tank without getting stuck.
- Insert the ty-wrap or string into the carburetor area and push it down into the tank, out through the gas cap hole.
- Slide the end of the fuel line over the ty-wrap or string. Use it as a "fish tape" to pull the fuel line up through the tank opening.
- Once the fuel line is in place, cut off any excess string or ty-wrap, and install the fuel filter if you haven't already.
- Finally, ensure that the fuel line is secure and properly connected to the carburetor.
The Stihl string trick is a useful method for inserting fuel lines into chainsaw tanks. It may take some practice to perfect the technique, but it is a straightforward and effective way to replace your chainsaw's fuel lines.
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Removing the vibe screws to open the gap between the tank and carb floor
To remove the vibe screws to open the gap between the tank and carb floor, follow these steps:
- Locate the vibe screws: These screws are typically found near the tank and carb floor area of the chainsaw. They are responsible for reducing vibrations during operation.
- Gather the necessary tools: You will need a scrench (a combination of a screwdriver and a wrench) or a flat-head screwdriver and a socket wrench. These tools will allow you to unscrew and remove the vibe screws.
- Unscrew the vibe screws: Using the appropriate tool, carefully unscrew the vibe screws. Turn them counterclockwise to loosen and remove them. Be gentle to avoid stripping the screws or damaging the surrounding components.
- Open the gap: Once the vibe screws are removed, you can gently pry open the gap between the tank and the carb floor. This step may require some careful manipulation to create enough space for accessing the fuel line.
- Prepare the fuel line: Before inserting the fuel line, cut the tip of the fuel line that fits into the tank on a diagonal angle. This angled cut will make it easier for the fuel to feed into the tube and facilitate the insertion process. You can also consider using a lubricant on the tube to aid in ease of entry.
- Insert the fuel line: With the gap opened and the fuel line prepared, carefully feed the fuel line into the tank. Ensure you follow any specific guidelines or routing instructions provided by the chainsaw manufacturer.
Remember to work carefully and patiently when performing these steps. Always refer to the chainsaw's user manual or seek professional assistance if you are unsure about any part of the process.
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Frequently asked questions
Cut the end of the line at a 45-degree angle to make it easier to insert into the tank. Lubricate the line with soap, grease, or WD-40 to aid in ease of entry. Push the line into the tank and pull it out through the mouth of the tank using hemostats, pliers, or a thin piece of wire attached to a key ring.
A fuel line is a tube that carries fuel from the tank to the carburetor in a chainsaw. Over time, the fuel line can become brittle and crack, or become clogged, which will prevent the engine from getting fuel and starting.
You will need a utility knife or scissors, hemostats or needle-nose pliers, and a fuel line kit. You may also need a thin piece of wire attached to a key ring to help guide the fuel line into the tank.
If your chainsaw doesn't start even though it has enough fuel, the fuel line may be clogged or cracked. Inspect the fuel line for any signs of damage and replace if necessary.










































