When a weed eater starts but quickly dies, several factors could be at play. It’s crucial to inspect critical components like the spark plug, carburetor, and fuel filter, which are essential for proper engine operation. If these components are functioning correctly, the issue may lie with the fuel quality or the air filter, which can cause engine starvation or impaired airflow. Additionally, the fuel line or carburetor may be clogged, preventing sufficient fuel from reaching the engine. Troubleshooting involves examining these components, cleaning or replacing faulty ones, and ensuring proper maintenance practices to prevent such issues in the future.