When a compressed natural gas (CNG) or liquefied petroleum gas (LPG) powered vehicle is parked inside a membrane structure, all of the following conditions shall be met:
- The quarter-turn shutoff valve or other shutoff valve on the outlet of the CNG or LPG container shall be closed and the engine shall be operated until it stops. Valves shall remain closed while the vehicle is indoors.
- The hot lead of the battery shall be disconnected.
- Dual-fuel vehicles equipped to operate on gasoline and CNG or LPG shall comply with the requirements of this section and FC 2404.18 through 2404.18.3 for gasoline-powered vehicles.