Trimmer Fuel Line Replacement: A Step-By-Step Guide

Replacing the fuel lines in a gas trimmer is a common repair, as the plastic lines break down and become brittle over time. This can be caused by the addition of ethanol in gas, which tends to break down rubber and cause fuel lines to crack and discolour. The repair process involves removing the old fuel lines, inspecting and diagramming the fuel line setup, and then installing new lines. It is important to wear protective gear and work in a well-ventilated area when performing this repair.

Remove the fuel system cover

To remove the fuel system cover, you'll need to disassemble the trimmer enough to access its entire fuel system. The first step is to locate the fuel cover, which is usually on the rear of the engine. Once you've found it, remove any fasteners that affix the cover to the engine. This will give you access to the carburetor.

Every trimmer is a little different, so you may need to consult the owner's manual for your specific model to locate the fuel cover and determine how to remove it. It's important to keep track of any fasteners you remove so that you can reassemble the trimmer correctly later on.

Once the cover is removed, you'll be able to access the carburetor and continue with the next steps of the fuel line replacement process. Remember to work in a well-ventilated area and take the necessary safety precautions when working with fuel systems.

In the case of the Ryobi 767rj Line Trimmer, for example, the fuel tank, carburetor, fuel lines, and carburetor mount plate will come off together. So, after removing the fuel system cover, the next steps would be to unscrew the carburetor fasteners, release the throttle cable, and then remove the entire fuel assembly.

Disconnect the spark plug wire

Disconnecting the spark plug wire is one of the first steps to take when replacing the fuel lines in your gas trimmer. This is an important safety precaution to prevent accidental ignition during the repair process. Here is a detailed guide on how to disconnect the spark plug wire:

Locate the spark plug: The spark plug is usually located near the engine or motor of the gas trimmer. It consists of a small cylindrical component with a wire attached to it.

Prepare the work area: Before proceeding, ensure that you are working in a well-ventilated area, away from any open flames or ignition sources. Clear the area around the spark plug to provide adequate space for work. Place a clean cloth or paper towel nearby to wipe away any fuel or debris.

Inspect the spark plug: Once the wire is disconnected, take a moment to inspect the spark plug for any signs of corrosion, carbon deposits, or damage. If necessary, use a wire brush to clean the spark plug gently. Ensure that the area around the spark plug is free from dirt and debris.

Store the spark plug wire safely: Set aside the spark plug wire in a secure location, away from the immediate work area. Ensure that it does not come into contact with any fuel or sharp objects that may cause damage. You will need to reconnect the wire to the spark plug once the fuel line replacement is complete.

Remember, disconnecting the spark plug wire is a crucial safety step when working on any gas-powered equipment. Always exercise caution and refer to the manufacturer's instructions or a qualified technician if you have any questions or concerns.

Remove the fuel filter

Removing the fuel filter from your gas trimmer is a simple process, but it requires careful attention to ensure you don't damage any other components. Here is a step-by-step guide to help you through the process:

Step 1: Disconnect the Spark Plug

Before you begin any work on your gas trimmer, it is essential to disconnect the spark plug wire. This step is crucial for safety reasons, as it prevents the engine from accidentally starting while you are working. Make sure to pull the spark plug wire straight off the spark plug.

Step 2: Drain the Fuel Tank

In a well-ventilated area, remove the fuel cap and empty the remaining fuel from the tank into an approved storage container. Old fuel is considered hazardous waste, so be sure to dispose of it properly. You can use a small funnel to help with this process and ensure you don't spill any fuel.

Step 3: Locate the Fuel Filter

The fuel filter is located inside the gas tank. It is usually a white or opaque cylinder, approximately an inch or two in length, and attached to the end of the small fuel line. You may need a pair of needle-nosed pliers or a straightened wire hanger with a hooked end to help fish out the filter from the tank.

Step 4: Remove the Fuel Filter

Once you have located the fuel filter, gently pull it off the end of the fuel line. In some cases, there may be a retaining ring or other small pieces holding the filter in place, so be sure to remove these carefully before sliding off the old filter. Set the old filter aside, as you will need to dispose of it properly.

Step 5: Clean the Area (Optional)

Before installing the new fuel filter, it is a good idea to clean the area where the old filter was attached. You can use a stiff-bristle brush and mild soap and water to scrub away any residue or debris. Then, blow out any excess water with compressed air and finish drying the area with a clean cloth.

Now that you have successfully removed the old fuel filter, you can move on to installing the new one. Remember to dispose of the old filter and any other waste appropriately and to work in a well-ventilated area to ensure your safety.

Disconnect the lines from the carburettor

Before disconnecting the lines from the carburettor, it is important to take safety precautions. Work in a well-ventilated area, away from open flames and other ignition sources. Drain any fuel left in the fuel tank into an approved container. Cap the gas can and set it aside so that it does not accidentally spill. Old fuel is considered hazardous waste, so be sure to dispose of it according to the relevant laws and guidelines.

Now, to disconnect the lines from the carburettor:

Firstly, make a diagram or take a picture of how the fuel lines are configured between the tank and the carburettor. This will be useful when reassembling the parts. Note the small and large lines, as well as their connections and ports.

Next, remove the fuel lines from the carburettor. You can use a pair of needle-nose pliers or hemostat forceps to do this. Grasp the old fuel line inside the tank and carefully pull it into the tank and out through the filler opening. If the fuel line comes apart while pulling it out, it is advisable to tip the trimmer and shake it to remove any remaining pieces.

Once you have removed all the parts of the fuel line, find the fuel filter and plastic connector (if applicable) and set them aside. The rest of the old fuel line can be discarded.

After disconnecting the fuel lines from the carburettor, you can proceed with installing the new fuel lines. It is recommended to replace the primer bulb along with other fuel system components, as the plastic may have worn out.

Reattach the fuel system

Now that you have installed the new fuel lines and other components, it's time to reattach the fuel system and reassemble your trimmer.

First, double-check your installation of the new fuel lines against your diagram one last time before proceeding with the reassembly. Ensure that all the lines are connected correctly and securely.

Next, position the fuel tank back into its place. Securely reinstall the fasteners that hold the carburetor mount plate in position. This will vary depending on your trimmer model, so refer to your diagram or a manual for your specific trimmer if needed.

Now, reinstall the throttle cable into the carburetor. Thread the throttle cable through its designated hole in the mount plate and reattach it securely to the carburetor.

Then, affix the carburetor to the mount plate. This usually involves reinstalling the fasteners that hold the carburetor to the plate. Ensure that all connections are secure.

Finally, replace the fuel system cover. You may need to guide the carburetor's choke lever through an access opening, depending on your trimmer model. Securely replace all fasteners that hold the cover in position.

Your trimmer is now reassembled with new fuel lines installed. Remember to wear the appropriate safety gear and work in a well-ventilated area when performing this repair. Always refer to the specific instructions and safety guidelines provided by the manufacturer of your trimmer.

Frequently asked questions