Recreational Vehicle (RV) Technician Practice Test

What is the purpose of an overfilling prevention device in a propane system?

1. To enhance the overall gas efficiency

2. To prevent excessive gas pressure in the container

3. To ensure safe filling without overflow

4. To regulate the flow of propane into the burner

The correct answer is: To ensure safe filling without overflow

The purpose of an overfilling prevention device in a propane system is to ensure safe filling without overflow. This device plays a crucial role in preventing the propane tank from being filled beyond its safe capacity, which could lead to dangerous situations such as leaks or explosions. By limiting the amount of propane that can enter the tank, the device ensures that there is enough space for the gas to expand as it heats up, preventing pressure buildup that could compromise safety. This device is particularly important during the refueling process, where improper filling could lead to the propane spilling out, creating hazards. In contrast, options that focus on gas efficiency, pressure regulation in the container, or controlling the flow into burners do not specifically address the prevention of overfilling, which is the primary function of this safety mechanism. Thus, the correct answer highlights the essential safety feature of preventing overflow during propane tank filling.