Are you required to have a type b fire extinguisher on board a vessel with permanently installed fuel tanks?

Motorboats with permanently installed fuel tanks must have at least one B-I extinguisher. Boats over 26 feet may require more. B-I is either 2 pounds dry chem, 4 pounds CO2 or 6 quarts foam.According to US Coast Guard regulations. 46 CFR 25.30.