1. Vapor Lock:
- Cause: When the engine is hot, fuel can vaporize in the fuel line or carburetor, creating vapor lock and blocking the fuel flow.
- Solution: Make sure there's adequate ventilation around the engine, and allow it to cool down for a few minutes before attempting to restart. You can also try loosening the gas cap slightly to release any built-up pressure.
2. Dirty/Clogged Carburetor:
- Cause: A dirty or clogged carburetor can disrupt proper fuel flow when the engine is hot.
- Solution: Regularly clean or replace the fuel filter. If the problem persists, have the carburetor cleaned or rebuilt by a qualified technician.
3. Malfunctioning Fuel Pump:
- Cause: A faulty fuel pump might fail to provide sufficient fuel pressure when the engine is hot.
- Solution: Check the fuel lines for leaks and the fuel pump itself for damage. You might need to replace the fuel pump if it's defective.
4. Faulty Ignition System:
- Cause: Issues with the spark plug, spark plug wire, ignition coil, or other components of the ignition system can affect restarts.
- Solution: Check for loose connections, damaged wires, or worn-out spark plugs. Replace any faulty components as needed.
5. Thermal Overload Switch:
- Cause: Some Briggs & Stratton engines have a thermal overload switch designed to protect against overheating. If the engine gets too hot, the switch trips, cutting off power to the ignition system.
- Solution: If the thermal overload switch has tripped, allow the engine to cool down, and the switch should automatically reset.
If none of these suggestions resolve the issue, there might be an underlying mechanical problem with the lawn mower engine. In such cases, it's best to consult a certified small engine mechanic or an authorized Briggs & Stratton repair center for diagnostics and repairs.
