1991 Chevy Van
CNG cylinder is a DOT type 4 composite cylinder and will be mounted beneath the van parallel to the drive shaft. The cylinder is approximately 11 inches in diameter and 72 inches long. The gasoline gallon equivalent (GGE) of this cylinder is 5 gallons. More cylinders can be added later.
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NFPA 52 - Fuel Systems Code
Michigan State Police Regulations - CNG Fuel Systems Word Document
CNG Fueling Station Locator