Mercedes Mullins
If you are having trouble locating the fuel filter on your Briggs & Stratton lawn mower, you are not alone. Many people have struggled to find the fuel filter on their 500 series mower engine. The fuel filter may be located inside the fuel tank or in the fuel line. The location of the fuel filter depends on the engine's design. If you are unable to locate the fuel filter, refer to your Briggs & Stratton manual or check your engine Illustrated Parts List.
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What You'll Learn
Fuel filter location
The fuel filter location in a Briggs & Stratton lawn mower engine depends on the engine's design. In some equipment, such as walk-behind mowers, the fuel filter may be built into the fuel tank and may not be serviceable. If the filter is installed inside the tank, you will need to drain the tank before removing the filter for inspection or replacement.
If your fuel filter is installed in the fuel line, you will need to remove the metal clips on each side of the filter using needle-nose pliers and then slide the filter out.
To prepare a new fuel filter and line assembly for installation, trim the new line to match the length of the old one. Attach the shorter end of the fuel line to the port on the tank and the longer end to the carburetor port. Secure the line with the retaining clamps.
With the filter in place, reposition the filter cover and rethread the screw to secure it.
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Replacing the fuel filter
The fuel filter in a Briggs Stratton lawn mower may be located inside the fuel tank and may not be serviceable. If you cannot easily locate the fuel filter, it may be an in-tank design.
To replace the fuel filter, you will need to purchase a new one. When purchasing a fuel filter, you will have to decide on the micron rating, which is the measurement of filtration capability. The smaller the micron number, the better the filter is at screening out particulates.
Before installing a new fuel filter, make sure the engine has cooled. Remove the wire and boot from the spark plug to prevent the engine from accidentally starting. It is recommended that you perform this procedure with no fuel in the tank.
Use a 5/16th inch socket or nut driver to unthread the screw securing the air filter cover. Remove the cover and the filter, then use a Phillips-head screwdriver to remove the screw securing the carburetor cover. Now, attach the shorter end of the fuel line to the port on the tank and the longer end to the carburetor port. Secure the line with the retaining clamps.
With the new filter in place, reposition the filter cover and rethread the screw to secure. Reattach the wire and boot to the spark plug, and refill the fuel tank. Your engine should now be ready to use.
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Fuel filter installation
To install a fuel filter in a Briggs and Stratton lawn mower, you should first consult your manual or a local dealer to ensure you have the correct replacement filter for your engine. When purchasing a fuel filter, you will need to decide on the micron rating—a smaller micron number indicates a better filtration capability.
Before beginning the installation, make sure the engine has cooled down and that there is no fuel in the tank. Remove the wire and boot from the spark plug to prevent accidental ignition.
Next, use a 5/16th inch socket or nut driver to unthread the screw securing the air filter cover. Remove the cover and the filter, then use a Phillips-head screwdriver to remove the screw securing the carburetor cover. Realign the carburetor cover and rethread the screw.
Now, attach the shorter end of the fuel line to the port on the tank and the longer end to the carburetor port. Secure the line with retaining clamps.
With the filter in place, reposition the filter cover and rethread the screw to secure it. Reattach the wire and boot to the spark plug, and refill the fuel tank. Your engine should now be ready to use.
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Fuel filter micron rating
The fuel filter in a Briggs and Stratton lawn mower can be located either inside the fuel tank or fitted into the fuel line between the tank and the fuel pump. Some engines have internal, non-serviceable fuel filters.
When purchasing a fuel filter, you will need to decide on the micron rating. The micron rating is the measurement of filtration capability, with a smaller micron number indicating a higher capability of screening out particulates. Briggs and Stratton 40-micron fuel filters are available for lawn mower fuel lines. The red disc-type filters are 150 microns, and the white or light grey disc-type filters are 75 microns. Both of these types of filters are for gravity feed applications and contain brass screens. The bigger cylindrical plastic filters with a paper element inside are 60 microns, and the bigger cylindrical metal filters are 10 microns. These two types are used in fuel pump applications.
To replace the fuel filter on a Briggs and Stratton small engine, first ensure the engine has cooled. Then, remove the wire and boot from the spark plug to prevent accidental ignition. It is recommended to perform this procedure with no fuel in the tank. Use a 5/16 inch socket or nut driver to unthread the screw securing the air filter cover. Remove the cover and the filter, then use a Phillips-head screwdriver to remove the screw securing the carburetor cover. Prepare the new fuel filter and line assembly by trimming the new line to match the length of the old one. Attach the shorter end of the fuel line to the port on the tank and the longer end to the carburetor port, securing the line with retaining clamps. Reattach the wire and boot to the spark plug, refill the fuel tank, and the engine should be ready for use.
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Troubleshooting fuel starvation
If your Briggs & Stratton lawn mower is experiencing fuel starvation, there are several troubleshooting steps you can take to identify and resolve the issue.
First, it is important to understand the role of the fuel filter and fuel pump in your lawn mower. The fuel filter screens out particulates from the fuel, while the fuel pump is used when the gas tank is mounted lower than the carburetor, preventing gravity from carrying gas through the fuel line. A fuel pump issue could be the cause of fuel starvation, so it is important to inspect and potentially replace the pump if necessary.
To troubleshoot fuel starvation, start by checking the fuel level and ensuring there is sufficient fuel in the tank. Old or stale fuel can also cause issues, so if you have fuel left over from the previous season, drain the tank and refill it with fresh fuel. Stale fuel can break down and cause engine damage, so it is important to use a fuel stabilizer to extend the life of your fuel.
Next, inspect the fuel filter for any signs of damage or clogging. The fuel filter may be located in the fuel tank and might not be serviceable. If this is the case, you may need to replace the entire fuel tank. If your fuel filter is serviceable, refer to the repair instructions specific to your Briggs & Stratton model for guidance on replacing the fuel filter. When purchasing a new fuel filter, consider the micron rating, which indicates the filtration capability—a smaller micron number indicates a better filtering performance.
If the issue persists, the problem may lie with the carburetor. Spray carburetor cleaner directly into the carburetor after the engine shuts off. If the engine restarts without waiting for 15 minutes, it confirms that the issue is related to fuel or the carburetor. In this case, tap the side of the carburetor to help the flow of gas. If this does not work, you may need to replace the fuel filter or seek further assistance from a Briggs & Stratton Service Dealer.
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Frequently asked questions
The fuel filter in your Briggs & Stratton lawn mower could be installed inside the fuel tank or in the fuel line. Refer to your Briggs & Stratton manual to determine the location.
The engine stopping after a few seconds or running poorly are common reasons to replace the fuel filter.
First, make sure the engine has cooled and that there is no fuel in the tank. Then, remove the wire and boot from the spark plug. Follow the fuel filter installation instructions for your specific model.
You will need a Phillips-head screwdriver, a 5/16 inch socket or nut driver, and pliers.
