Question 1772 Deck General

The correct answer is B) Shut-off valves. On small passenger vessels, the regulations require shut-off valves to be installed at both the tank and engine connections of all internal combustion engine fuel lines. These shut-off valves allow the fuel supply to be quickly and easily isolated in the event of a leak or other emergency, which is a critical safety feature for small passenger vessels. The other answer choices, such as clean-out plates, fuel gauges, and drain valves, are not required at these specific locations on the fuel lines.