Stop
Gasoline leaks are a fire hazard. Do not run the engine, smoke, or use tools that could spark near the leak until it's fixed and the area is clean and dry.
Symptoms
- Strong gasoline smell around the mower
- Visible wet spots or drips near the tank or fuel line
- Fuel level drops faster than normal use would explain
- Puddle forms under the mower when parked
Likely causes
- CommonCracked or brittle fuel lineRubber fuel lines dry out and crack with age and heat exposure, especially in older mowers.
- CommonOverfilled fuel tankFilling above the recommended line can cause fuel to seep out through the cap vent, especially in heat or on a slope.
- PossibleDamaged fuel tank or cracked seamPlastic tanks can crack from age, impact, or UV exposure.
- PossibleWorn fuel cap gasketA dried-out gasket in the fuel cap can let fuel weep out around the cap.
What to do
- Stop using the mower immediately and move it away from any ignition sources or open flame.
- Let any spilled fuel evaporate and clean the area with an absorbent material, disposing of it properly.
- Inspect the fuel line for cracks, especially near clamps and connection points, and replace if damaged.
- Check the tank fill level; drain any excess fuel above the recommended line.
- Inspect the fuel cap gasket and replace it if it's hard, cracked, or not sealing well.
- Check the tank itself for visible cracks; a cracked tank needs replacement, not patching, due to fire risk.
Tools and parts
- Rags
- Basic wrench set
Fuel line replacementSearch: “lawn mower fuel line”
Fuel cap with gasketSearch: “lawn mower fuel cap replacement”
When to call a pro
A cracked fuel tank should be replaced by a professional or with manufacturer-approved parts rather than patched.
Safety
Stop
Gasoline leaks are a fire hazard. Do not run the engine, smoke, or use tools that could spark near the leak until it's fixed and the area is clean and dry.