Section 183.568 - Anti-siphon protectionEach fuel line from the fuel tank to the fuel inlet connection on the carburetor must:
(a) Be above the level of the tank top; or(b) Have an anti-siphon device or an electrically operated fuel stop valve:(1) At the tank withdrawal fitting; or(2) Installed so the line from the fuel tank is above the top of the tank; or(c) Provided that the fuel tank top is below the level of the carburetor inlet, be metallic fuel lines meeting the construction requirements of § 183.538 or "USCG Type A1" hose, with one or two manual shutoff valves installed as follows: (1) Directly at the fuel tank connection arranged to be readily accessible for operation from outside of the compartment, and(2) If the length of fuel line from the tank outlet to the engine inlet is greater than 12 feet, a manual shutoff valve shall be installed at the fuel inlet connection to the engine.CGD 74-209, 42 FR 5950, Jan. 31, 1977, as amended by CGD 81-092, 48 FR 55737, Dec. 15, 1983; CGD 85-098, 52 FR 19729, May 27, 1987