Parts and Accessories Necessary for Safe Operation; Auxiliary Fuel Tanks

Federal Motor Carrier Safety Administration (FMCSA), Department of Transportation (DOT).

Notice of proposed rulemaking (NPRM).

FMCSA proposes to add an exception to the prohibition on gravity and syphon feeds for auxiliary pumps with a fuel tank capacity of less than 5 gallons mounted on the trailer chassis frame or trailer bed, for purposes other than operation of the motor vehicle, that are operational only when the motor vehicle is not in motion. This proposal is in response to a petition for rulemaking from the Truck Trailer Manufacturers Association (TTMA). The proposed change would provide relief from a regulatory requirement without impacting safety.

Comments must be received on or before July 29, 2025.

You may submit comments identified by Docket Number FMCSA-2025-0120 using any of the following methods:

• Federal eRulemaking Portal: Go to https://www.regulations.gov/​docket/​FMCSA-2025-0120/​document. Follow the online instructions for submitting comments.
• Mail: Dockets Operations, U.S. Department of Transportation, 1200 New Jersey Avenue SE, West Building, Ground Floor, Washington, DC 20590-0001.
• Hand Delivery or Courier: Dockets Operations, U.S. Department of Transportation, 1200 New Jersey Avenue SE, West Building, Ground Floor, Washington, DC 20590-0001, between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays. To be sure someone is there to help you, please call (202) 366-9317 or (202) 366-9826 before visiting Dockets Operations.
• Fax: (202) 493-2251.