StacksVerified U.S. regulatory reference

33 CFR §183.528

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
  1. (a)Each electrically operated fuel stop valve in a fuel line between the fuel tank and the engine must:
    1. (1)Open electrically only when the ignition switch is on; and
    2. (2)Operate manually.
  2. (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.