CFR › Title 33 › Part 183 › §183.58033 CFR §183.580Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗Copy linkA fuel tank is tested by performing the following procedures in the following order:(a)Fill the tank with air or inert gas to the pressure marked on the tank label under § 183.514(b)(5).(b)Examine each tank fitting and seam for leaks using a leak detection method other than the pressure drop method.