Section 183.528 - Fuel stop valves(a) Each electrically operated fuel stop valve in a fuel line between the fuel tank and the engine must: (1) Open electrically only when the ignition switch is on; and(b) If tested in accordance with the fire test under § 183.590 , a fuel stop valve installed in a fuel line system requiring metallic fuel lines or "USCG Type A1" hose must not leak fuel.CGD 74-209, 42 FR 5950, Jan. 31, 1977, as amended by CGD 85-098, 52 FR 19728, May 27, 1987