November 12, 2019

On June 21, 2019, NHTSA Published a Notice of Proposed Rulemaking (NPRM) Relating to FMVSS 304, Compressed Natural Gas Fuel System Container Integrity (49 CFR 571.304)

DATES: Comments must be received on or before August 20, 2019.

SUMMARY: FMVSS 304 currently contains an inspection requirement for CNG fuel system containers of 36 months or 36,000 miles, whichever comes first for all size vehicles.  Both the current and the proposed standard requires inspection for deterioration and damage after a motor vehicle accident. NHTSA recognizes that heavy duty commercial vehicles may put 36,000 miles on the vehicle in a very short period, which might lead to multiple inspections within a year.  It proposes to Amend FMVSS 304, S7.4 Labeling to require the following statement:

“(g) The statement: ‘‘This container should be visually inspected for damage and deterioration after a motor vehicle accident or fire, and either (a) at least every 12 months when installed on a vehicle with a GVWR greater than 4,536 kg or (b) at least every 36 months or 36,000 miles, whichever comes first, when installed on a vehicle with a GVWR less than or equal to 4,536 kg.’’