Trimmer Fuel Lines: Replacing For Better Performance

Replacing the fuel lines on a trimmer is a common repair, as plastic fuel lines break down over time, becoming brittle and prone to cracking. This is a multi-step process that requires a set of tools and safety precautions. The first step is to remove the trimmer's fuel system, which involves taking off the fuel tank, carburetor, fuel lines, and carburetor mount plate. It is important to note the configuration of the fuel lines and to draw a diagram or take photographs for reference during reassembly. The next step is to remove the old fuel lines and install the new ones, ensuring they are securely connected to the fuel tank and carburetor. Finally, the fuel system can be reassembled, and the trimmer tested to ensure it is functioning correctly.

Fuel line replacement tools

Fuel line replacement is a common repair task for trimmer owners, as the plastic fuel lines tend to break down and become brittle over time. To replace trimmer fuel lines, you will need the following tools:

• A set of drivers that fit your tool's fasteners
• A pair of flush-cut diagonals or other cutters
• Needle-nose pliers
• A screwdriver (preferably flat-head)

Additionally, you may need a fuel line disconnect tool, which can be purchased at most automotive stores, to safely remove the old fuel lines from their fittings.

• Disconnect the spark plug wire to prevent accidental starting.
• Remove the fuel system cover to access the carburetor.
• Unscrew and remove the carburetor fasteners, throttle cable, and any other components attached to the carburetor mount plate.
• Take out the entire fuel assembly, including the fuel tank, carburetor plate, and carburetor.
• Draw a diagram or take pictures of the fuel line setup to ensure proper installation of the new lines.
• Remove the old fuel lines from their fittings using a screwdriver or fuel line disconnect tool.
• Pull out the overflow return line and fuel filter line from the fuel tank.
• Install the new fuel filter line by feeding it into the correct hole in the fuel tank. Ensure it is flush with the tank.
• Secure the fuel filter line with a retaining ring, if applicable, using a pair of pliers.
• Refer to your diagram or pictures and install the remaining new fuel lines, pressing them onto their fittings by hand.
• Reattach the fuel system by positioning the fuel tank and reinstalling the carburetor mount plate, throttle cable, and other components.
• Replace the fuel system cover and secure it with fasteners.

By following these steps and using the right tools, you can successfully replace the fuel lines in your trimmer, ensuring its optimal performance and longevity.

Removing the trimmer's fuel system

The first step in replacing a trimmer's fuel lines is to remove the trimmer's fuel system. This process can vary slightly depending on the make and model of your trimmer, but the basic steps are as follows:

Step 1: Remove the Fuel System Cover

The fuel cover is usually located at the rear of the engine. Remove any fasteners that affix the cover to the engine to access the carburetor.

Step 2: Unscrew Carburetor Fasteners

The trimmer's carburetor is typically affixed to the engine against a plate, sometimes called a carburetor choke plate. Release any fasteners on the carburetor.

Step 3: Release the Throttle Cable

Most trimmer throttle cables thread through the carburetor choke plate and attach to the carburetor. Simply lift and tilt the carburetor to release the throttle cable.

Step 4: Unscrew Fasteners Holding the Mount Plate

With the carburetor freed up, the only remaining step before removing the entire fuel system is to unscrew the fasteners holding the carburetor mount plate in place.

Step 5: Remove the Fuel Assembly

At this point, the fuel tank, carburetor plate, and carburetor are still connected by the fuel lines. Remove them together before disturbing the fuel line arrangement.

Step 6: Diagram the Fuel Lines

Before continuing, it is important to inspect and diagram the fuel line setup to avoid any mix-ups during reassembly. Note the holes in the fuel tank, choke plate, and carburetor through which the fuel lines pass. Also, make note of which primer bulb connections the "in" and "out" lines attach to.

Step 7: Remove the Old Fuel Lines

Trimmer fuel lines are usually tightly attached to their fittings. Attempting to pull them off can risk breaking them. Instead, use a flat-head screwdriver to gently push them off their fittings.

Step 8: Remove the Overflow Return Line

On some trimmers, the overflow line leading from the primer bulb can simply be pulled out.

Step 9: Remove the Fuel Filter Line

The fuel filter line may have a small retaining ring on the outside of the fuel tank, helping to hold the fuel filter in place. Remove the retaining ring with a screwdriver, then cut and push the old fuel filter line and fuel filter into the tank.

Step 10: Replace the Primer Bulb

It is recommended to replace the primer bulb along with the other fuel system components, as the plastic on the primer bulb is likely to wear at the same rate as the fuel lines.

With these steps, you will have successfully removed the trimmer's fuel system, and you can now proceed to install the new fuel lines and reassemble the fuel system.

Drawing a diagram of the fuel lines

Firstly, locate the fuel tank and the carburetor on the trimmer. The fuel tank is usually located at the rear of the engine, and it holds the fuel that is supplied to the engine. The carburetor, on the other hand, is responsible for mixing air and fuel before it enters the engine. It is often affixed to the engine with a plate, sometimes called a carburetor choke plate.

Next, identify the fuel lines that connect the fuel tank and the carburetor. There should be at least two fuel lines – one for fuel input and one for fuel output. These lines may pass through the carburetor choke plate via several holes, so take note of their routing.

Now, grab a piece of paper and a pencil, and start drawing the diagram. Begin by sketching the fuel tank and the carburetor, including any relevant holes or connections. Note the position of the fuel filter, which is usually attached to the end of the fuel line inside the fuel tank. Then, draw the fuel lines, indicating their path and any connections they make with the fuel tank, primer bulb, and carburetor. Make sure to label each component and connection clearly.

As you draw, take note of the following:

• The hole in the fuel tank where the fuel filter attaches.
• The hole in the carburetor choke plate through which the filtered "in" line from the fuel tank passes.
• The point where the "in" line connects to the carburetor.
• The path of the carburetor "out" line as it passes through the choke plate.
• The connection between the "out" line and the primer bulb.
• The correct line to connect to the remaining primer bulb attachment site.
• The correct hole in the fuel tank through which the primer overflow line passes.

By creating this diagram, you will have a visual reference that will guide you during the disassembly and reassembly process. It will help you understand how the fuel lines are routed, ensuring that you can put everything back together correctly. Remember to keep the diagram nearby as you work on replacing the trimmer's fuel lines.

Removing the old fuel lines

Disconnect the Spark Plug Wire: Start by pulling the spark plug wire straight off the spark plug. This is an important safety precaution to prevent accidental starting of the engine during the maintenance process.

Empty 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. This step ensures that you are working with a dry system and reduces the risk of fuel spills during the line replacement process.

Remove the Fuel Filter: Locate the fuel filter inside the gas tank. It is usually a white cylinder attached to the end of the small fuel line. Use a pair of needle-nosed pliers or a straightened wire hanger with a hook to carefully fish out the filter from the tank. Once the filter is out, pull it off the end of the fuel line.

Disconnect the Lines from the Carburetor: Before removing the fuel lines, it is important to understand their configuration. Make a diagram or take a picture of how the fuel lines are routed between the tank and the carburetor. This will be helpful when installing the new fuel lines. Using needle-nose pliers, carefully remove the fuel lines from the carburetor.

Pull Out the Old Fuel Lines: Grip the old fuel lines with needle-nose pliers and pull them out of the tank. If the lines are difficult to pull out, cut them flush with the tank and use a small screwdriver to push the remaining portions into the tank. Tip the trimmer and shake it to remove any small fuel line pieces that may be left inside.

Clean the System: Once all the old fuel lines have been removed, take the opportunity to clean the system. Ensure that there is no debris or residue left inside the tank or on any of the fittings. This step will help prevent clogs and ensure a smooth fuel flow when the new lines are installed.

Inspect the System: Before installing the new fuel lines, thoroughly inspect the entire fuel system for any signs of damage, wear, or cracks. Pay close attention to the fittings, connectors, and the carburetor. If you notice any issues, address them accordingly before proceeding with the new fuel line installation.

Remember to work in a well-ventilated area and wear appropriate safety gear, including gloves and eye protection, when performing these steps. With these detailed instructions, you will be able to successfully remove the old fuel lines from your trimmer, setting the stage for a smooth and efficient installation of the new fuel lines.

Installing the new fuel lines

• Remove the old fuel lines from the trimmer. This may involve disconnecting the fuel filter or removing the trimmer's housing.
• Thread the new fuel lines through the appropriate openings in the trimmer's housing, ensuring they are properly connected to the fuel tank and carburetor.
• Reassemble the trimmer.
• Test the trimmer to ensure it is running smoothly with the new fuel lines.

With a little patience and attention to detail, your trimmer will be running like new in no time!

• Gather all the necessary tools and equipment for the job, including a socket wrench set, pliers, a fuel line disconnect tool, and new fuel lines.
• Locate the old fuel lines in your vehicle, usually near the fuel tank and the engine bay.
• Carefully remove the old fuel lines using the appropriate tools, being cautious not to damage any other components.
• Prepare the new fuel lines for installation by ensuring you have the correct size and type for your vehicle.
• Connect the new fuel lines to the fuel tank and the engine using the socket wrench and pliers to tighten the fittings properly. Ensure that the connections are secure and there are no loose ends.
• Check for any leaks by turning on your vehicle's engine and letting it run for a few minutes.
• Test the new fuel lines using a pressure test and a flow test to ensure proper functioning and to prevent potential issues.

Frequently asked questions