What should be checked to prevent the gas line from freezing?

Keeping at least half a tank of gas is crucial to prevent the gas line from freezing for several reasons. A fuller tank reduces the amount of air in the tank, which decreases the chance of condensation forming. When condensation occurs, it can lead to water being introduced into the fuel system. This water can freeze, especially in cold weather, causing blockages that can prevent fuel from reaching the engine.

Additionally, maintaining a sufficient fuel level ensures that you have enough gas to keep the engine running, particularly during emergencies or if unexpected weather events occur. Having at least half a tank provides a buffer against not only freezing conditions but also other potential issues such as being stranded in bad weather or running into delays.

In contrast, the other options either do not provide adequate fuel to minimize condensation risk or suggest running on empty, which can exacerbate problems.