How to Change Your Lawn Mower’s Fuel Filter: A Step-by-Step Guide
Is your lawn mower sputtering, losing power, or refusing to start altogether? Before you assume the worst, check the fuel filter.
Over time, dirt and debris can clog the filter, starving your engine of the petrol it needs to run smoothly. Replacing it is one of the easiest and cheapest DIY maintenance tasks you can perform. In this guide, we’ll walk you through how to swap out your fuel filter in under 10 minutes.
Why Replace Your Fuel Filter?
There are many benefits to changing your engine's fuel filter. A fuel filter is designed to properly strain the fuel, preventing foreign particles from reaching the carburettor and clogging the fuel system of the engine.
A clean fuel filter ensures that only pure gasoline reaches your carburetor. If the filter is clogged:
- The engine may stall under load.
- You’ll experience decreased fuel efficiency.
- Sediment can reach the engine, leading to costly repairs.
Most experts recommend changing the filter once a year or every 50 hours of use.
Tools and Supplies You’ll Need
You don't need a professional workshop for this. Grab these basics:
- New Fuel Filter: Ensure it matches your mower’s make and model. Click on this link to go to the Fuel Filters ordering page...
- Pliers: Needle-nose or standard slip-joint pliers.
- Fuel Line Clamp: To prevent fuel spillage.
- Small Container: To catch any stray drips of gasoline.
- Gloves and Safety Glasses: Safety first!
Video 'How to Change Your Mower's Fuel Filter' by Briggs & Stratton
Step-by-Step Instructions
1. Safety First
Always work in a well-ventilated area and allow the engine to cool completely, keep fuel away from heat sources. Park your mower on a flat surface and disconnect the HT Lead from the spark plug. This prevents the engine from accidentally starting while you’re working near the fuel system.
2. Locate the Filter
Follow the fuel line from the fuel tank toward the engine. The fuel filter is usually a small plastic cylinder (often translucent) spliced into the rubber hose. For fuel filters located inside the fuel tank, drain all remaining fuel before removing the filter for inspection or replacement.
3. Pinch the Fuel Line
For engines equipped with a fuel tap or valve—usually found at the base of the tank or along the fuel line—close the valve to stop the fuel flow. If your tank does not have a tap, to prevent a petrol spillage, use a fuel line clamp or a pair of locking pliers on the hose between the fuel tank and the filter.
Pro Tip: If you don't have a clamp, try to perform this task when the fuel tank is nearly empty.
4. Remove the Old Filter
Slide the metal tension clips away from the filter using your pliers. Gently twist and pull the fuel lines off the filter nozzles. Have your small container ready to catch the teaspoon or two of petrol that will inevitably leak out.
5. Install the New Filter
This is the most important part: Many fuel filters include a flow direction arrow printed on the new filter.
- The arrow must point toward the engine (away from the petrol tank).
- Push the fuel lines onto the new filter nozzles and slide the tension clips back into place over the connection.
6. Check for Leaks
Remove your clamps, reconnect the spark plug wire, and turn on the fuel valve (if equipped). Start the mower and let it run for a minute while checking the connections for any dampness or drips.
Common Signs Your Filter Needs Replacing
| Symptom | Likely Cause |
| Engine Surging | Intermittent fuel flow through a partial clog. |
| Hard Starting | Not enough fuel reaching the combustion chamber. |
| Mower Dies in Tall Grass | Engine is starved of fuel when it needs more power. |
Click on this link to go to the Fuel Filters ordering page...
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TOP TIP! |
Regular maintenance is the secret to a lawn mower that lasts a decade rather than a couple of seasons. Don't forget to check your air filter and oil levels while you're at it! |
FAQ's
How often should I change my lawn mower fuel filter? For optimal performance, you should replace the fuel filter once a year or every 50 hours of engine use. If you notice your mower sputtering or losing power during the season, it’s worth checking the filter for clogs immediately.
Can I clean a lawn mower fuel filter instead of replacing it? Most modern fuel filters are made of pleated paper or fine mesh inside a sealed plastic housing, making them impossible to clean effectively. Given how affordable replacement filters are, it is much safer for your engine to install a new one than to risk reintroducing debris.
Does it matter which way the fuel filter goes? Yes. Most fuel filters are directional. Look for a small arrow stamped on the body of the filter; this arrow must point in the direction of the fuel flow (away from the petrol tank and toward the carburretor/engine).
What happens if I don't change my fuel filter? A neglected filter will eventually become fully restricted, leading to hard starting, engine stalling, or a total loss of power. In some cases, a degraded filter can allow sediment to bypass it, which can clog your carburretor and lead to expensive professional repair bills.
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