On small passenger vessels, outlets in fuel lines are permitted __________.

Correct Answer: Option B — under no circumstances in gasoline installations

46 CFR 182.440 prohibits outlets or petcocks in gasoline fuel lines on small passenger vessels. This regulation minimizes the risk of fuel leakage and fire hazards, as gasoline is highly volatile and any unnecessary opening in the pressurized fuel system poses a significant danger to the vessel and crew.