Question 1113 Deck Safety

The correct answer is B) be liquid-and vapor-tight. A safe fuel system must be liquid-and vapor-tight to prevent fuel leaks, which can lead to fire hazards. Fuel leaks can allow flammable liquid and vapors to escape, creating an unsafe condition. The fuel system must be designed and maintained to contain all fuel and prevent any unintended release, which is a key safety requirement for marine vessels. The other answer choices are not directly related to the primary safety requirement of a fuel system being liquid-and vapor-tight. While important, engine cooling, fuel-air mixture, and air supply are secondary considerations compared to the fundamental need to contain the fuel and prevent leaks.