Which statement is FALSE concerning precautions during fueling operations?

The statement that fuel tanks should be topped off with no room for expansion is incorrect because it does not account for the necessary allowance for fuel expansion due to temperature changes. Fuels can expand when heated, and if a tank is filled to the brim without any space for expansion, it increases the risk of fuel spilling out. This can lead to hazardous situations, including environmental contamination and fire hazards.

In contrast, it is standard practice during fueling operations to leave adequate headspace in fuel tanks to accommodate thermal expansion, ensuring safety and compliance with regulations. The other practices mentioned, such as closing all windows, doors, and hatches, keeping a fire extinguisher readily available, and ensuring all engines and motors are shut down, are vital safety measures designed to minimize risks during fueling operations and help prevent accidents or fires.