To start the engine, what position must the transmission be in?

The correct position for the transmission when starting the engine is neutral. This is a critical safety feature in many vehicles, as starting the engine in neutral ensures that the vehicle cannot move unexpectedly in either forward or reverse directions.

When the transmission is in neutral, it allows the engine to start without engaging the transmission, meaning the wheels are not connected to the engine's power. This is particularly important for mobile pump operators, as it ensures there is full control over the vehicle and its movement when beginning operation.

In contrast, if the transmission were in drive or reverse during the engine start, it could engage the drivetrain inadvertently and potentially cause an accident or injury. Similarly, while the park position can allow the engine to start, it is specifically designed for vehicles with automatic transmissions that also keep the vehicle stationary, whereas neutral is appropriate for both automatic and manual setups.