Replacing The Fuel Line In A Stihl 029: Step-By-Step Guide

The Stihl 029 Super is a chainsaw that requires regular maintenance to ensure top performance. Over time, the fuel line may deteriorate due to exposure to ethanol, dry rot, and gasoline. Additionally, the fuel filter can become clogged with dirt, sawdust, stale varnished fuel, and filter particles. Therefore, it is essential to replace the fuel line and filter to maintain the proper functioning of the chainsaw. This process involves disassembling specific parts, such as the carburetor, and carefully removing and installing the new fuel line and filter. While it may seem challenging, online resources and forums provide detailed instructions and tips to guide users through the replacement process.

Drain fuel and remove the fuel filter

To drain the fuel from your Stihl 029 chainsaw, set the chainsaw on a level surface and remove the spark plug boot to prevent accidental start-up. Remove the gas cap by lifting the locking lever to the vertical position and turning the cap counterclockwise. If the tank still has gas inside, siphon it into a container with a hand siphon.

To remove the fuel filter, form a hook at the end of a 12-inch piece of 12- or 14-gauge wire. Reach into the tank with the wire, hook it around the filter, and pull the filter out. You may need a flashlight to help you see inside the tank. Hold the fuel line firmly with one hand while you work the filter off with a flat-head screwdriver.

Remove the air filter cover, air filter, and throttle linkage

To remove the air filter cover, air filter, and throttle linkage of your Stihl 029, follow these steps:

First, depress the throttle until you can see the top of the trigger. Then, using a small screwdriver, gently pop or pry up on the throttle linkage to lift it out of the trigger groove. This will allow you to separate the linkage from the trigger. Next, remove the air filter cover and air filter. The air filter cover and air filter are typically sold together as a single unit, so you won't need to remove them separately. You can purchase a replacement air filter with a cover specifically designed for the Stihl 029 model. This will ensure a proper fit and maintain the effectiveness of the air filtration system.

When removing the throttle linkage, be careful not to apply too much force, as you don't want to damage the trigger or any surrounding components. It may be helpful to have a small screwdriver and a pair of needle-nose pliers on hand to make this process easier. Additionally, ensure that you have a clean work area and wear appropriate protective gear, such as gloves and eye protection, to safeguard against any debris or fuel residue.

Once you have successfully removed the air filter cover, air filter, and throttle linkage, set them aside in a safe place. You can now access the carburetor and proceed with the next steps of your fuel line replacement or repair. Remember to refer to the official Stihl 029 manual or seek guidance from a qualified technician if you need further clarification or assistance during the process.

Remove the carburetor

To remove the carburetor of a Stihl 029 chainsaw, follow these steps:

First, drain the fuel from the chainsaw and remove the air filter cover, air filter, and throttle linkage. To remove the throttle linkage, depress the throttle slightly until you see the top of the trigger, then pop or pry it up and out of the trigger groove using a small screwdriver.

Next, remove the carburetor. This can be done using long-nosed needle-nose pliers or hemostats/forceps. Grab the fuel line just below where it comes through the top of the fuel tank, and use the screwdriver end of a scrench to push on the flange/grommet on the fuel hose into the tank. Pull down and out at the same time with pliers or hemostats/forceps.

Now that the carburetor is accessible, you can begin to remove it. Loosen any mounting screws or clamps holding the carburetor in place and carefully lift it out, being mindful of any attached fuel lines or hoses. Place the carburetor in a safe location, away from the work area, to avoid accidental damage.

Once the carburetor is removed, inspect it for any signs of damage, wear, or clogging. Pay close attention to the jets and passages, as these are prone to clogging from dirt, debris, or old fuel. If necessary, clean or replace the carburetor before reinstalling it.

To reinstall the carburetor, simply follow the removal process in reverse. Ensure that all fuel lines and hoses are securely connected to the carburetor before starting the chainsaw.

Remove the fuel line with pliers or hemostats

To remove the fuel line with pliers or hemostats, you'll need to follow these steps:

First, remove the air filter cover, air filter, and throttle linkage. Depress the throttle slightly until you can see the top of the trigger, then pop or pry up the linkage out of the trigger groove using a small screwdriver. Next, remove the carburetor. Now, take your long-nosed needle-nose pliers (hemostats/forceps) and reach through the fuel fill hole to grab the fuel line just below where it comes through the top of the fuel tank. Using the screwdriver end of the scrench, push on the flange/grommet on the fuel hose into the tank and pull down and out at the same time with your pliers or hemostats.

You may need to apply a little force to remove the fuel line, but be careful not to damage any other components. Once the fuel line is removed, you can install a new one. It is recommended to apply a small amount of premix to the bottom of the new fuel hose flange/grommet inner lip before inserting it.

Install the new fuel hose

To install the new fuel hose, follow these steps:

Firstly, apply a small amount of pre-mix or oil to the bottom of the fuel hose flange/grommet's inner lip. This will act as a lubricant and help the hose to slide into place more easily. Next, insert the filter end of the hose from the top of the tank, ensuring that the hose bulkhead flange is aimed towards the filler hole of the tank.

Now, insert a pair of needle-nose pliers through the fill opening and grab the hose near the top of the tank. Keep a steady, slight pressure on the hose, pulling it into the tank. At the same time, gently push the flange/grommet into place with a screwdriver. You may need to walk around the flange a bit, maintaining slight pressure from the pliers and using the tank top as a fulcrum to pull the hose into the groove in the fuel line flange.

Finally, roll the carburetor end of the fuel hose back into its slot.

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