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Frequently Asked Questions

Why and how to change a fuel filter in small engines?

Posted in Maintenance

There are many benefits to changing a fuel filter in your small engine. A fuel filter is designed to properly strain the gas before it reaches the carburetor in your lawn mower, snow blower or equipment.

Fuel filter replacement is important because:

  • It prevents foreign particles from clogging your engine
  • Dirty fuel filters can cause your engine to run too lean, leading to diminished performance and uneven operation
  • Clean filters conserve the amount of gas you need

Where Is My Fuel Filter Located?
Finding the Right Fuel Filter for Your Small Engine
How to Perform Fuel Filter Replacement

Changing a Fuel Filter

Engine WarningWARNING: Always read the engine and equipment manual(s) before starting, operating, or servicing your engine or equipment to avoid personal injury or property damage. See an authorized dealer or contact Briggs & Stratton if you are unsure of any procedure or have additional questions. Find all Engine Safety Warnings

Where is My Fuel Filter Located?

The fuel filter will be located either inside the fuel tank or fitted into the fuel line between the tank and the fuel pump.

If you are unsure of where your fuel filter is located, refer to your Briggs & Stratton manual to determine the location.
Where to Find Lawn Mower Fuel Filters

Finding the Right Fuel Filter for Your Small Engine

The proper fuel filter for your engine depends on the engine's design. Check your engine Illustrated Parts List or consult your local Briggs & Stratton dealer for the correct replacement filter. Once you know the correct part, you can also purchase Briggs & Stratton fuel filters online.

How to Perform Fuel Filter Replacement

Wear safety eyewear whenever removing or inspecting a filter to protect your eyes from liquid fuel or fuel vapors. Have a dry cloth handy to hold the filter and catch any dripping fuel.

If the filter is installed inside the tank, you will need to drain the tank before you can remove the filter for inspection or replacement.

  1. Shut the fuel valve, if equipped. It's located at the base of the fuel tank, where the gas line is attached. If your tank is not equipped with a valve, clamp the gas line, using a fuel line clamp.
  2. If your filter is installed in the fuel line, remove the metal clips on each side of the filter, using needle nose pliers, and slide the filter out of the fuel line (Image A)
    In-line Fuel Filter
  3. Shake the filter over a clean cloth to displace any remaining fuel, then use the cloth to wipe away any residue from the outside of the filter.
  4. Keep the filter a safe distance from your face and look through one end (Image B).
    Clean Fuel Filter
  5. You should be able to see light shining through clearly from the other side. If debris is clogging the mesh screen, pleated paper or the inside of the casing, replace the old filter with a new replacement fuel filter.
  6. When replacing the fuel filter, be sure to reconnect the metal clips on both sides of the filter.
  7. Remove the clamp on the fuel line or reopen the fuel valve when the fuel filter is secure.
  8. Check for leaks. Do not operate the unit if any are found.

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