What is the correct method to shut off a gas engine?

Shutting off a gas engine typically involves cutting off the ignition, which stops the engine from running. The ignition system controls the spark that ignites the fuel-air mixture in the engine's cylinders. By shutting off the ignition, you effectively stop this process, leading to the engine shutting down safely and promptly.

While other methods, such as shutting off the fuel supply or pulling a safety lever, may also contribute to stopping the engine, the most immediate and effective method for ensuring that an engine ceases operation is by interrupting the ignition source. This approach minimizes the chance of backfiring and ensures that the engine halts quickly without lingering fuel combustion.

In contrast, turning off the battery switch could cut power to components but may not directly stop the engine if the ignition system remains functional from another source. Similarly, only shutting off the fuel supply may lead to engine stalling, but the risk of residual combustion remains unless the ignition is fully disabled.