1. Fuel Starvation:
- Clogged Fuel Filter: A dirty or clogged fuel filter can restrict the flow of fuel to the carburetor. Check and clean or replace the fuel filter if necessary.
- Fuel Line Issues: Inspect the fuel line for kinks, cracks, or leaks that could be causing fuel flow problems.
- Dirty Carburetor: Over time, the carburetor can accumulate dirt and debris, affecting its performance. Check and clean the carburetor as needed.
2. Choke Issues:
- Stuck Choke: If the choke is not opening properly after starting the engine, it can restrict airflow and cause the engine to stall. Check and ensure that the choke is functioning correctly.
3. Spark Plug Problems:
- Faulty Spark Plug: A worn or damaged spark plug can cause ignition issues and lead to the engine stopping after a short run time. Check the spark plug and replace it if necessary.
4. Air Filter Blockage:
- Dirty Air Filter: A dirty or clogged air filter can restrict airflow and affect the engine's performance. Clean or replace the air filter as needed.
5. Overheating:
- Cooling Fan Issues: Make sure the cooling fan is functioning properly and not blocked by debris. Insufficient cooling can cause the engine to overheat and shut down.
6. Low Oil Level:
- Insufficient Oil: Check the oil level and ensure it is within the recommended range. Low oil can cause engine damage and lead to stalling.
To troubleshoot the problem:
1. Check for fuel issues:
- Ensure there is enough fuel in the tank.
- Confirm the fuel valve is open.
- Disconnect the fuel line from the carburetor and verify that fuel flows freely from the tank.
- If fuel flow is obstructed, check for clogs or kinks in the fuel line or filter.
2. Inspect the Spark Plug:
- Remove the spark plug and check its condition.
- Look for signs of wear or damage, such as a worn electrode, cracks, or deposits.
- If necessary, replace the spark plug with a new one.
- Ensure the spark plug gap is set correctly according to the engine specifications.
3. Check the Air Filter:
- Inspect the air filter for dirt or debris that could be restricting airflow.
- Clean the air filter if necessary or replace it if it is severely clogged.
4. Examine the Carburetor:
- Check for any visible damage or leaks.
- Remove and inspect the carburetor. Look for any blockages, dirt, or debris inside. Clean or replace the carburetor as needed.
- Ensure that the carburetor is seated correctly and properly connected to the engine.
5. Verify Oil Level:
- Check the oil level and add more oil if necessary.
- Ensure the oil is clean and of the correct type specified in your lawn mower's manual.
6. Check Cooling System:
- Ensure there are no obstructions blocking airflow around the engine and that the cooling fins are clean.
- Verify the cooling fan is rotating freely. Fix or replace any issues identified during the inspection.
If you have tried all the above steps and the engine still stops after 15 minutes, you may need to consult a professional for further diagnosis and repair.
