NHTSA Deletes Obsolete CNG Fuel-System Text
Published Date: 6/3/2026
Rule
Summary
The government updated safety rules for compressed natural gas (CNG) vehicles by removing old, outdated text to keep things clear and current. This change affects manufacturers and anyone involved with CNG vehicle safety standards. The new rule kicks in on July 6, 2026, with no extra costs expected, making CNG vehicles safer and regulations simpler.
Analyzed Economic Effects
2 provisions identified: 2 benefits, 0 costs, 0 mixed.
Which CNG Vehicles Must Meet S6 Tests
The rule clarifies which compressed natural gas (CNG) vehicles must meet parts of FMVSS No. 303. Each passenger car, multipurpose passenger vehicle, truck, and bus with a GVWR of 10,000 pounds or less that uses CNG must meet the requirements of S6 except S6.4, and each school bus with a GVWR greater than 10,000 pounds that uses CNG must meet S6.4. These changes take effect on July 6, 2026.
Obsolete CNG Rules Removed — No Expected Costs
NHTSA removed obsolete text from FMVSS No. 303 to simplify the rule; the agency states there are no expected extra costs and certified the rule will not have a significant economic impact on a substantial number of small entities. The final rule is a deregulatory action and becomes effective on July 6, 2026.
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Key Dates
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Previous: 2026-11068, Federal Motor Vehicle Safety Standards No. 216; Roof Crush Resistance, Federal Motor Vehicle Safety Standard No. 216a; Roof Crush Resistance; Upgraded Standard
Starting July 6, 2026, the old roof crush safety rule (FMVSS No. 216) is officially out, making way for the upgraded FMVSS No. 216a. This change affects car makers who now follow the stronger, updated roof crush resistance standards to keep passengers safer. No big costs expected since the new rule already guides the industry, but manufacturers should note the deadline and get ready!
Next: 2026-11070, Federal Motor Vehicle Safety Standards No. 217; Bus Emergency Exits and Window Retention and Release
The government updated rules for bus emergency exits and windows by removing old, unnecessary requirements. This change affects bus makers and helps keep safety standards clear and up-to-date. The new rules kick in on July 6, 2026, with no extra costs expected.