Replacing Fuel Lines On Stihl Km110r: A Step-By-Step Guide

If you're looking to replace the fuel lines on your Stihl KM110R, there are a few things you should know. Firstly, check which style of fuel line your machine has. Older models used a separate hose with a tank grommet, while newer versions feature a one-piece snorkel design. This newer design can also be retrofitted to older engines. You can opt for OEM parts or generic alternatives, as long as they are the same size and fit for purpose. When reconnecting the fuel line, look for a removable connector at the top of the tank where the fuel hose connects to the carburettor. Use a small screwdriver to pry it out, attach the fuel hose and filter, then reinstall the connector. Be sure to also check the assembly for any cracks or leaks, as air leaks in the fuel supply can affect fuel delivery to the carburettor.

Pry the connector out with a small screwdriver

To replace the fuel lines on a Stihl KM110R, you will need to remove the connector from the fuel tank. This can be done by prying it out with a small screwdriver. Here's a step-by-step guide on how to do this:

Step 1: Locate the Connector

Find the connector on the top of the fuel tank where the fuel hose connects to the carburetor. This removable connector is where the fuel hose and filter attach.

Step 2: Prepare Your Tools

Before you begin, ensure you have the necessary tools, including a small screwdriver. It is essential to use a screwdriver that is small enough to fit into the connector and provide leverage without causing damage.

Step 3: Pry Out the Connector

Gently insert the tip of the small screwdriver into the connector. Apply a slight force to lift or wedge the connector out of its housing. Be careful not to scratch or damage the surrounding components.

Step 4: Remove the Connector

Once you have successfully pried the connector loose, carefully lift it out of the fuel tank. Take your time with this step to avoid any accidental spills or damage to the connector or the fuel tank.

Step 5: Install the New Fuel Hose

With the connector removed, you can now install the new fuel hose and filter. Ensure that the new fuel hose is securely attached to the connector and that the filter is properly positioned.

Step 6: Reinsert the Connector

Finally, carefully guide the connector back into the fuel tank, ensuring it is securely seated in its original position.

By following these steps and taking your time, you can successfully replace the fuel lines on your Stihl KM110R by prying out the connector with a small screwdriver. Remember to work carefully and avoid using excessive force to prevent damage to your equipment.

Install the fuel hose and filter to the connector

To install the fuel hose and filter to the connector on a Stihl KM110R, follow these steps:

First, locate the removable connector at the top of the fuel tank, where the fuel hose connects to the carburetor. Use a small screwdriver to gently pry and remove this connector from the tank. Ensure you do not apply excessive force to avoid damaging the connector or the surrounding components.

Next, attach the fuel hose and filter to the connector. This step may require some careful maneuvering to ensure the hose and filter are securely attached. Check that the hose is firmly seated onto the connector to prevent leaks.

Once the fuel hose and filter are securely attached, carefully reinsert the connector back into the tank. Ensure it is correctly seated and secured in place.

After completing these steps, carefully inspect your work to ensure the fuel hose, filter, and connector are all properly installed and secured. This will help prevent any fuel leaks or other potential issues.

If you encounter any difficulties or are unsure about any steps, it is recommended to seek assistance from a qualified technician or refer to the Stihl KM110R product manual for more detailed instructions.

Check the assembly for cracks and leaks

To check the assembly for cracks and leaks, you will need to inspect the fuel supply line inside the tank. Depending on the style of your KM110, you will either have a plastic connector at the fuel tank with two lines plugged into it or a solid green moulded hose assembly.

If you have the older model with a plastic connector, you can remove it with a small screwdriver. Check the connector and the fuel hose for any cracks or damage.

If you have the newer model with the moulded hose assembly, you will need to inspect the hose for any cracks or signs of damage.

In both cases, it is important to ensure that the assembly is secure and free from any leaks. If there are any cracks or leaks, the assembly will need to be replaced.

Additionally, it is recommended to check the carburettor for any leaks, as this could also be causing the issue.

Pressure test the line to test for a leak

Pressure testing your fuel line is a critical step in ensuring the safety and integrity of your STIHL KM110R's fuel system. Here is a detailed, step-by-step guide on how to pressure test the fuel line to check for leaks:

Preparation:

• Ensure that the main fuel supply valve is shut off. This is an important safety measure to prevent accidental fuel flow during the test.
• Inform everyone in the area about the test to ensure their safety and cooperation.

Testing Procedure:

• Attach a suitable pressure gauge to the fuel line's test point or the appliance connection point. The gauge should be appropriate for the pressure levels being tested.
• Carefully introduce pressure into the fuel line using air or nitrogen. The pressure applied will depend on the system's requirements. Residential systems typically use around 15 pounds per square inch (psi).
• Once pressurized, closely monitor the gauge. A steady reading indicates no leaks, while a dropping gauge suggests a potential leak. Maintain the pressure for the duration specified in your local plumbing codes to ensure accuracy.

Identifying and Addressing Leaks:

• If a leak is suspected, apply a soap solution to the joints and connections. The formation of bubbles indicates the precise location of the fuel leak.
• Any identified leaks should be repaired promptly. After making repairs, repeat the pressure test to confirm the integrity of the fuel line and ensure that the issue has been resolved.

Additional Considerations:

• Comply with local plumbing and building codes. These codes dictate specific requirements for pressure testing fuel lines, including test duration, pressure levels, and documentation. Failing to adhere to these codes can invalidate the test and pose legal and safety risks.
• Document the test results, including the pressure applied, test duration, and outcome. This documentation may be required by local authorities and can also be useful for future maintenance and reference.
• After completing the test and ensuring no leaks are found, carefully restore the fuel supply. Ensure all appliances are functioning correctly, and re-light any pilot lights if necessary.

By following these steps diligently and adhering to relevant plumbing codes, you can effectively pressure test your STIHL KM110R's fuel line and ensure a safe and efficient testing process.

Buy a new carburettor

If you are looking to replace the carburettor on your Stihl KM110R, there are a number of options available to you.

Firstly, you can purchase a new carburettor from a Stihl service centre. This option will provide you with a genuine Stihl part, which is likely to be of high quality and compatibility. However, this option may be more expensive than other alternatives.

Alternatively, you can purchase a replacement carburettor online from websites such as eBay or Amazon. These websites offer a range of aftermarket carburettors that are designed to fit the Stihl KM110R. For example, you can find carburettors on Amazon that are compatible with the Stihl KM110, KM110R, KM130, and KM130R trimmers. These carburettors typically range in price from $15 to $20 and often include additional tools or maintenance kits. When purchasing from Amazon, be sure to read the reviews to ensure that you are buying a quality product.

Similarly, eBay offers a range of carburettors that fit the Stihl KM110R, as well as other models in the KM series. These carburettors are typically priced around $6 and are described as being brand-new and unused. Again, be sure to check the seller's ratings and reviews to ensure the quality and compatibility of the product.

When purchasing a replacement carburettor, it is important to consider factors such as compatibility, quality, and price. Additionally, keep in mind that some carburettors may not come with fuel lines, so you may need to purchase those separately.

Frequently asked questions