Final answer:
In an internal combustion engine, it is recommended to let the engine blower run for a few minutes before starting the gasoline engine.
Step-by-step explanation:
In an internal combustion engine, the engine blower is typically turned on to supply air to the engine for combustion. The duration of time the engine blower should be on depends on the specific engine and its operating conditions. Generally, it is recommended to let the blower run for a few minutes to ensure sufficient airflow before starting the gasoline engine.