16 Tex. Admin. Code § 13.39
No licensee shall introduce compressed natural gas (CNG) into any container if he has knowledge or notice that such CNG container or system was not installed in accordance with the statutes of the State of Texas, and with the rules and regulations in effect at the time of installation. Exception: This section does not apply to motor fuel or mobile fuel containers and systems installed on vehicles licensed in states other than Texas.
Source Note:The provisions of this §13.39 adopted to be effective November 15, 1990, 15 TexReg 5936.