33 C.F.R. § 183.538 Metallic fuel line materials.
Title 33 - Navigation and Navigable Waters
Each metallic fuel line connecting the fuel tank with the fuel inlet connection on the engine must: (a) Be made of seamless annealed copper, nickel copper, or copper-nickel; and (b) Except for corrugated flexible fuel line, have a minimum wall thickness of 0.029 inches.
Title 33: Navigation and Navigable Waters
PART 183—BOATS AND ASSOCIATED EQUIPMENT
Subpart J—Fuel Systems
Equipment Standards
§ 183.538 Metallic fuel line materials.
