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Why does a Briggs and Stratton 6.75 hp lawn mower engine stop after 2-3 seconds it starts?

Fuel-related issues

1. Low fuel level: Make sure the fuel tank has enough gas.

2. Clogged fuel filter: A dirty fuel filter can restrict the flow of fuel to the carburetor. Replace it if necessary.

3. Faulty fuel line: Check for any kinks or cracks in the fuel line that may be preventing the fuel from reaching the carburetor.

Spark plug issues

4. Fouled spark plug: Remove and inspect the spark plug. Clean or replace it if necessary.

5. Faulty spark plug wire: Check the spark plug wire for any damage or corrosion. Replace it if necessary.

Air filter issues

6. Clogged air filter: A dirty air filter can restrict airflow to the engine. Clean or replace it if necessary.

Oil-related issues

7. Low oil level: Check the oil level and add more if necessary.

8. Dirty oil: Old or dirty oil can prevent the engine from running properly. Change the oil according to the manufacturer's recommendations.

Other mechanical issues

9. Stuck float: The float in the carburetor controls the fuel level. If it gets stuck, it can cause the engine to flood and stop running.

10. Faulty carburetor: The carburetor mixes fuel and air for the engine. If it's not working properly, it can cause the engine to run erratically or stall.

11. Weak compression: If the engine doesn't have enough compression, it won't be able to start or run properly. Check the compression and have the engine repaired if necessary.

12. Faulty ignition switch: The ignition switch controls the flow of electricity to the spark plug. If it's faulty, it can prevent the engine from starting.

13. Defective starter solenoid: The starter solenoid engages the starter motor. If it's defective, it can prevent the engine from starting.