Unless they are adequately ventilated, enclosed compartments or spaces containing diesel fuel tanks and no machinery must be provided with a gooseneck vent of not less than 2
1/2 inches in diameter. The vent opening must not be located adjacent to possible sources of vapor ignition.
source: CGD 83-005, 51 FR 896, Jan. 9, 1986, unless otherwise noted.
cite as: 46 CFR 169.627