StacksVerified U.S. regulatory reference

46 CFR §182.435

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
  1. (a)Gasoline fuel tanks must be independent of the hull.
  2. (b)Diesel fuel tanks may not be built integral with the hull of a vessel unless the hull is made of:
    1. (1)Steel;
    2. (2)Aluminum; or
    3. (3)Fiber reinforced plastic when:
      1. (i)Sandwich construction is not used; or
      2. (ii)Sandwich construction is used with only a core material of closed cell polyvinyl chloride or equivalent.
  3. (c)During the initial inspection for certification of a vessel, integral fuel tanks must withstand a hydrostatic pressure test of 35 kPa (5 psig), or the maximum pressure head to which they may be subjected in service, whichever is greater. A standpipe of 3.5 meters (11.5 feet) in height attached to the tank may be filled with water to accomplish the 35 kPa (5 psig) test.