Fuel Tank: Description and Operation

FUEL TANK - TYPE 4

A Type 4 CNG fuel tank is constructed of composite material and is wrapped in fiberglass and epoxy. A high pressure lock-off solenoid is contained within the fuel tank and is used to prevent fuel flow during non-cranking or running engine conditions. Fuel tanks have a protective cover. The cover is designed to protect the tank from damage due to shifting cargo and also for ultra-violet (UV) radiation protection. The cover is not designed to support a load. Federal government regulations require that the fuel tank and brackets be inspected every 3 years or 60 000 km (36,000 mi), whichever comes first. Fuel tank inspection results should be recorded in the CNG Fuel Tank Inspection Record area of the owners manual supplement. The service life of the CNG fuel tank can be 15 years or 20 years from the date of manufacture. All CNG fuel tanks regardless of inspection results must be replaced after their expiration date has passed. The CNG fuel tank expiration date is always listed on the tank label. Refer to Fuel Tank Inspection (Type 4 Tank) procedures.