What should tank setters do prior to refilling a tank?

Ensuring the integrity of the tank is crucial for safety and operational efficiency, which is why checking for any signs of damage or leaks is the correct procedure prior to refilling a tank. This step helps identify any potential hazards that could result in spills, toxic exposure, or environmental contamination. Assessing the tank for structural issues or leakages allows the tank setter to address any problems before the refilling process begins, thus safeguarding both personnel and the surrounding area.

The other options do not pertain to standard safety practices for refilling a tank. Increasing the fuel price is irrelevant to tank safety and operational procedures. Changing the tank location could be unnecessary and impractical unless there are specific safety or regulatory issues that necessitate relocation. Selling the tank's contents is also not a standard practice associated with refilling and does not pertain to the main concern of ensuring safe operational practices.