How To Change Your Mower's Fuel Filter Yourself

Clean fuel is essential for a smooth-running lawnmower engine. To ensure this, most lawn mowers come with replaceable fuel filters that prevent foreign particles in the fuel from clogging the engine. These filters are usually located inside the fuel tank or the fuel line. While the process of replacing a fuel filter differs slightly for each lawnmower engine, there is a general method that most homeowners can follow. This involves positioning the mower on a level, hard surface, allowing the engine to cool, clamping the fuel line hose, and then using pliers to loosen the clamps on both sides of the old fuel filter. The old filter can then be gently twisted and removed, before inserting and securing the new filter, ensuring that it faces the same direction as the old one.

Where is the fuel filter located?

The location of your mower's fuel filter depends on the type of mower you have. Some mowers have an external fuel filter located between the fuel tank and the carburetor, usually in the fuel line. This type of filter is typically easy to find and replace. However, other mowers have an internal fuel filter located inside the fuel tank.

If your mower has an external fuel filter, it will be located in the fuel line that connects the fuel tank to the carburetor. It is designed to prevent dirt and debris from entering the carburetor, which could cause the engine to malfunction or break down. The fuel filter is a small, cylindrical device with an inlet and an outlet. To find it, simply locate the fuel line and follow it from the fuel tank to the carburetor.

On push mowers, the fuel filter is often located on the side of the engine, just below the fuel tank. On riding mowers, you may need to look under the seat or near the engine compartment. Some mowers have a removable access panel that provides easier access to the fuel filter.

If your mower has an internal fuel filter, it will be located inside the fuel tank. These filters are typically non-serviceable, meaning they cannot be replaced. In this case, you may need to remove the fuel tank to access and clean or replace the filter.

It's important to note that the exact location of the fuel filter can vary depending on the make and model of your mower. Therefore, it is always a good idea to consult your owner's manual or do some research specific to your mower's make and model to locate the exact position of the fuel filter.

Why change the fuel filter?

A clogged fuel filter can stop your mower engine from running smoothly, or even stop it dead in its tracks. Dirty fuel filters can cause your engine to run too lean, leading to diminished performance and uneven operation.

Fuel filters are cheap and easy to replace, and it's a good idea to do this at least once a year as part of your annual mower maintenance. It will prevent costly repairs and extend the life of your engine.

If you use a lawn mower or any small engine machinery regularly, it’s wise to learn about fuel filters and how to change them.

How often should you change it?

Fuel filters should be replaced annually as part of your mower's routine maintenance. However, you can replace them more frequently if your engine shows signs of misfiring or sputtering.

The Tractor Supply Company (TSC) recommends changing your lawn mower's in-line fuel filter at least once a year. Some people prefer to change the filter as part of their spring maintenance, while others do it before storing their mower for the fall. If you use your mower frequently, TSC suggests changing the filter after every 100 hours of use.

In-tank filters, on the other hand, may take years to clog up and should only be changed by an experienced technician.

What are the steps to change it?

To change the fuel filter on your lawnmower, you will need to follow these steps:

Firstly, safety is important. Ensure you are in a well-ventilated area, with no open flames or sparks nearby. Wear safety goggles to protect your eyes from fuel, and have a dry cloth to hand to catch any drips. You should also wear gloves to protect your hands from fuel.

Now, you need to locate the fuel filter. It will either be inside the fuel tank or fitted into the fuel line between the tank and the fuel pump. If you are unsure, consult your owner's manual. If the filter is inside the tank, you will need to drain the tank before proceeding. If it is in the fuel line, you can skip this step.

Next, you will need to remove the old filter. If your filter is in the fuel line, use needle-nose pliers to remove the metal clips on each side of the filter, then slide it out. If your filter is inside the tank, you will need to refer to your owner's manual for specific instructions.

Once the old filter is out, you can prepare to install the new one. Check that the new filter is the correct replacement for your engine. Compare the new filter with the old one, noting the direction of the fuel flow, as indicated by arrows on the filter.

Now, insert the new filter. Ensure it is installed in the correct orientation, as indicated by the arrows. Reconnect any metal clips or clamps that you removed earlier.

Finally, check for leaks. Do not operate the mower if any leaks are found.

You have now successfully changed the fuel filter on your lawnmower.

What should you do before changing it?

Before changing the fuel filter on your lawnmower, there are several important steps to take to ensure your safety and that of the equipment. Firstly, locate a suitable workspace. Position the mower on a hard, level surface, preferably indoors, such as a garage. Allow the engine to cool completely before proceeding. This step is crucial for your safety, as working on a hot engine can cause burns.

The next step is to prepare the equipment and the area to avoid any spillage and to protect yourself from fuel vapours. Place a plastic or metal pan under the fuel line to catch any fuel that may run out during the process. Wear safety gloves to protect your hands from fuel, and safety eyewear to protect your eyes from fuel vapours and potential splashes. Have a dry cloth or towel handy to wipe up any spills and to hold the filter, catching any dripping fuel.

Now, you need to prepare the mower and ensure there is no risk of the engine accidentally starting. Disconnect the wire from the spark plug as a safety precaution. If your mower has a fuel valve, shut it off. It is usually located at the base of the fuel tank, where the gas line is attached. If your mower is not equipped with a valve, carefully clamp the gas line using a fuel line clamp. Do not pinch the fuel line, as this could cause damage.

At this point, you are ready to begin the process of changing the fuel filter.

Frequently asked questions