Parts and Accessories Necessary for Safe Operation; Fuel Tank Overfill Restriction

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

Notice of proposed rulemaking (NPRM).

FMCSA proposes to remove the requirement in the Federal Motor Carrier Safety Regulations (FMCSRs) that a liquid fuel tank manufactured on or after January 1, 1973, be designed and constructed so that it cannot be filled, in a normal filling operation, with a quantity of fuel that exceeds 95 percent of the tank's liquid capacity. This proposal is in response to a petition for rulemaking from the Commercial Vehicle Safety Alliance (CVSA). The proposed change would remove an unnecessary and outdated requirement from the FMCSRs.

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

You may submit comments identified by Docket Number FMCSA-2025-0117 using any of the following methods:

  • Federal eRulemaking Portal: Go to https://www.regulations.gov/​docket/​FMCSA-2025-0117/​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.
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