View all text of Subjgrp 245 [§ 183.510 - § 183.542]
§ 183.538 - Metallic fuel line materials.
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.