🔍 Key Concepts

• Fuel vapor behavior in small vessels (gasoline vapors are heavier than air) • Regulatory intent for fuel tank vent locations on inspected small passenger vessels (46 CFR Subchapter T – verify exact cite in current regulations) • Risk of ignition sources and hull openings near fuel vapor outlets

💭 Think About

• Which vent location best allows gasoline vapors to safely disperse overboard instead of collecting inside the vessel? • How would placing a vent near or below the waterline affect both safety and the vent’s ability to function properly? • Which option reduces the chance that vapors will enter the vessel through doors, ports, or other openings?

✅ Before You Answer

• Confirm that the vent must terminate outside the hull, not in an enclosed or semi‑enclosed space • Check that the location is above the normal waterline to prevent water from entering the vent line • Ensure the vent outlet is away from hull openings (like windows, doors, or engine air intakes) where vapors could drift back into the vessel