🔍 Key Concepts

• 46 CFR Subchapter T requirements for small passenger vessels • Safety features specific to gasoline engines versus diesel engines • The purpose of backfire flame control and where it is required

💭 Think About

• Which of these items directly prevents ignition of fuel vapors in a gasoline engine space? • Are jacket water temperature gauges and tachometers universally required on all small passenger vessel gasoline engines, or are they more common on larger/main propulsion plants? • Think about what the Coast Guard is most concerned about with gasoline as a fuel—what specific hazard is unique compared to diesel?

✅ Before You Answer

• Confirm which item is explicitly named in 46 CFR as required for gasoline engines on small passenger vessels • Check whether all listed instruments are mandated for every gasoline engine, or if some are optional or only for certain sizes/types • Verify which choice directly addresses the risk of explosion or fire from gasoline vapors