FMCSA Drops Exemption for Gravity-Fed Fuel Tanks on Diggers
Published Date: 7/30/2026
Notice
Summary
FMCSA withdraws its January 16, 2026, notice that requested public comment on an application from Charles Machine Works, Inc. (CMW) seeking renewal of a five-year exemption from the Agency's prohibition against the use of gravity-fed or siphon-fed fuel systems on commercial motor vehicles (CMVs). FMCSA has determined that the Agency's February 19, 2026, final rule titled "Parts and Accessories Necessary for Safe Operation; Auxiliary Fuel Tanks," provided the requested relief by amending the relevant regulation in a way that resolves the concerns outlined in CMW's original exemption request. Consequently, the exemption is now unnecessary, not only for CMW but also for any other entities that might have planned to request an exemption from the prohibition on gravity-fed or siphon-fed fuel systems on CMVs.
Analyzed Economic Effects
1 provisions identified: 1 benefits, 0 costs, 0 mixed.
5-Gallon Auxiliary Fuel Tank Exception
FMCSA amended 49 CFR 393.65(d) to allow gravity- or siphon-fed auxiliary fuel pumps with a nominal tank capacity of not more than five gallons mounted on the trailer chassis frame or trailer bed, for purposes other than operating the motor vehicle, that are operated only when the motor vehicle is not in motion. Because of this change, motor carriers and equipment manufacturers may use such systems without applying for an exemption; FMCSA considers related exemption renewal requests closed as of March 23, 2026.
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Key Dates
Department and Agencies
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