Fuel system requirements.

(a) Fuel systems for towing vessel main engines and generators must have a documented maintenance plan to ensure proper operation of the system. (b) A continuous supply of clean fuel must be provided to main propulsion engines and generators. (c) The fuel system must include filters and/or purifiers. Where filters are used: (1) A supply of spare fuel filters must be provided onboard; and (2) Fuel filters must be replaced in accordance with manufacturer's requirements or the vessel's TSMS, if applicable. (d) Except as otherwise permitted under § 143.210 or § 143.520, no fuel other than diesel fuel may be used.