🔍 Key Concepts

• Differences between diesel fuel and gasoline • Meaning of volatile when talking about fuels • What makes an engine/fuel system a fire or explosion hazard

💭 Think About

• Think about which fuel creates more explosive vapors in an enclosed engine room: diesel or gasoline? • Which option directly addresses fuel behavior, and which options describe mechanical features of the engine itself? • On small craft, what is the main safety concern that requires good ventilation around engines?

✅ Before You Answer

• Identify which choice deals with fuel properties, not engine construction or operation • Recall that gasoline vapors are a common cause of explosions on boats; compare that to diesel • Check which option most clearly reduces the risk of fire or explosion rather than just affecting performance or strength