Final answer:
The primary installation code for CNG cylinders and fuel system components depends on jurisdiction and regulations, but important codes to reference are NFPA 52, IFC, and NEC.
Step-by-step explanation:
The primary installation code for CNG cylinders and fuel system components depends on the specific jurisdiction and regulations. However, an important code to reference is the NFPA 52: Vehicular Natural Gas Fuel Systems Code, which provides guidelines for the installation and maintenance of CNG fuel systems. Additionally, the International Fire Code (IFC) and the National Electrical Code (NEC) may also have requirements related to the installation of CNG cylinders and fuel system components.