Replacing Husqvarna 125B Fuel Line: Step-By-Step Guide

If you're looking to replace the fuel line on your Husqvarna 125B leaf blower, you can buy a fuel line repair kit from Amazon or the Husqvarna website. The kit includes a new fuel filter, fuel lines to the primer, and lines out to the engine. It's important to ensure that the fuel lines are connected correctly, with the tank pickup line (usually the one with the filter) going to the bottom connection on the carburettor. The line from the top of the carburettor then attaches to the short hose barb on the primer bulb, and a line from the long hose barb on the primer bulb goes back into the tank.

Where the fuel lines should be connected

The fuel lines on your Husqvarna 125B leaf blower should be connected in a specific way to ensure the proper flow of fuel and the optimal performance of the engine. Here is a detailed guide on where the fuel lines should be connected:

The fuel tank on your Husqvarna 125B has a rubber gasket with two holes of different sizes. One hole is for the main fuel line, which needs to extend deep into the bottom of the fuel tank. This line supplies fuel to the engine. The other, smaller hole is for the return fuel line, which allows excess fuel to drain back into the tank. This line only needs to poke through the tank.

Now, moving towards the carburettor and primer bulb assembly, here's how the fuel lines should be connected:

The main fuel line coming from the tank connects to the bottom fuel line barb on the carburettor. This barb is usually on the choke lever side of the carburettor. From the top of the carburettor, another fuel line leads to the primer bulb assembly. Specifically, it connects to the shorter hose barb on the primer bulb.

From the longer hose barb on the primer bulb, a fuel line returns to the fuel tank. This completes the fuel circuit, allowing fuel to be drawn from the tank, through the carburettor, and back to the tank via the primer bulb assembly.

It's important to ensure that the fuel lines are not reversed, as this can affect the proper functioning of the engine. Also, make sure that the primer bulb is not sucking in air, which could indicate a leak in the system.

Reversing the lines at the bulb

The short line at the front of the primer bulb is the suction side and should be connected to the carburettor. The long line is the blow side and should be connected back to the fuel tank. This is counter-intuitive to many people, who expect the primer bulb to be pushing fuel into the carburettor.

To check if the lines are connected correctly, press the bulb. You should feel it blow out on one side and create suction on the other. The blow side is the long line that goes back to the fuel tank. The suction side is the short line that connects directly to the carburettor.

If the fuel lines are reversed, the leaf blower will not start or run properly.

The fuel line kit

The kit has received positive reviews from customers, who have noted that it is an exact replacement for the original part, easy to install, and comes with helpful instructions and videos.

• Purchase the fuel line kit. Ensure that it is compatible with your Husqvarna 125B model.
• Gather the necessary tools for the repair. You will need a screwdriver, pliers, a socket set, a wrench set, and a nut driver.
• Remove the left-side blower case, carburetor, and fuel tank.
• Take out the old fuel tank bushing and filter.
• Insert the new filter assembly into the fuel tank. You may need to use some lubricant to press the rubber boot into place.
• Clean the carburetor and reassemble it, ensuring that the new fuel lines are connected correctly. Refer to the diagram provided by Jon K., a Small Engine Diagnostic Expert, for guidance on fuel line routing.
• Reinstall the carburetor, left-side blower case, and air filter.
• Start the engine and adjust the carburetor as needed.

By following these steps and using the fuel line kit, you can replace the fuel line on your Husqvarna 125B leaf blower, ensuring it runs efficiently and safely.

The fuel filter

When replacing the fuel filter, it is crucial to use a compatible replacement part designed specifically for the Husqvarna 125B model. You can find genuine Husqvarna replacement parts on their official website or through authorised dealers. Additionally, some online retailers offer repair kits that include a new fuel filter, fuel lines, a primer bulb, and other necessary components for a comprehensive fuel system overhaul.

The process of replacing the fuel filter on a Husqvarna 125B leaf blower is relatively straightforward. First, drain the fuel tank to avoid spillage during the replacement process. Next, locate the fuel filter, which is typically attached to the fuel line that extends into the tank. Disconnect the old fuel filter from the fuel line, taking note of the orientation and routing of the fuel lines for correct reassembly. Then, attach the new fuel filter to the fuel line, ensuring a secure and proper connection. Finally, refill the fuel tank with a fresh mixture of gasoline and oil, following the manufacturer's recommended fuel ratio for your leaf blower.

It is important to note that incorrect fuel line routing can lead to issues with the leaf blower's performance. Ensure that the fuel line with the filter is connected to the bottom fuel line barb on the carburettor (choke lever side) and that the line from the throttle side goes to the primer bulb and back into the tank. This configuration allows the primer bulb to effectively draw fuel from the tank, through the carburettor, and return it to the tank.

The primer bulb

When replacing the fuel line on the Husqvarna 125B, it is important to pay close attention to the primer bulb and its connections. The fuel lines must be correctly routed to and from the primer bulb to ensure proper fuel flow. The short line coming from the fuel tank with the filter at the end should connect to the bottom fuel line barb on the carburettor, typically on the choke lever side. From there, a fuel line leads to the short hose barb on the primer bulb, and then another line from the long hose barb on the primer bulb goes back into the fuel tank. This setup allows the primer bulb to function correctly, pulling fuel from the tank, through the carburettor, and returning any excess to the tank.

If the primer bulb is not filling with fuel, it could be due to incorrect fuel line connections. Reversing the lines at the bulb or carburettor can often resolve this issue. It is also important to ensure that the fuel lines are not damaged or clogged, as this can restrict fuel flow and affect the performance of the primer bulb.

In some cases, a faulty primer bulb may be the issue. If the bulb is cracked, torn, or becomes stuck in a depressed position, it will need to be replaced. Additionally, if the bulb is not drawing fuel, it could indicate a problem with the carburettor, such as a bad gasket or a faulty check valve. In such cases, it is recommended to replace or rebuild the carburettor to resolve the issue.

When working on the primer bulb and fuel lines, it is always a good idea to refer to the Husqvarna 125B manual or seek guidance from a qualified small engine repair technician to ensure that the repairs are done correctly and safely.

Frequently asked questions