Which code pertains specifically to vehicular natural gas fuel systems according to the 2013 edition?

The correct choice focuses on NFPA 52, which is the code specifically addressing vehicular natural gas fuel systems. This standard establishes the safety requirements for the storage, handling, and use of compressed natural gas (CNG) and liquefied natural gas (LNG) in vehicles. Among its provisions, NFPA 52 includes guidelines for the installation of fuel systems in vehicles, safety requirements for refueling stations, and regulations pertaining to the design and operation of gas containers.

Understanding NFPA 52 is crucial for anyone involved in the operation or regulation of CNG vehicles, particularly drivers and maintenance personnel, as it outlines essential safety measures designed to minimize risks associated with natural gas as a fuel source in transportation. The other codes listed, though pertinent to gas and fuel systems, do not focus specifically on the vehicular applications of natural gas, which distinguishes NFPA 52 as the relevant standard for this context.