Question 1693 Deck General

The correct answer is D) 1 1/2 inches nominal pipe size. The Code of Federal Regulations (CFR) Title 46, Subchapter T, Section 182.15-10 specifies that the minimum fill pipe size for gasoline or diesel tanks on small passenger vessels must be 1 1/2 inches nominal pipe size. This regulation ensures that the fill pipe is large enough to allow fuel to flow into the tank without causing excessive backpressure or spills. The other options are incorrect because A) the regulations do specify a minimum fill pipe size, B) 1 1/2 inches is the required size, not just "large enough," and C) 2 1/2 inches is larger than the regulatory requirement for small passenger vessels.