How does CNG work?
The common CNG vehicle fuels at pressures of either 3,000 or 3,600 pounds per square inch (psi) and stores its fuel in one or more cylinders located under the body or in the trunk of the vehicle. The filling valve is located in the same general area as that of the gasoline refueling receptacle. When the CNG leaves the storage tank, it travels through high-pressure fuel lines into one or more pressure regulators, where it is reduced to atmospheric pressure. Unlike gasoline, which must be vaporized before ignition, CNG is already gaseous when it enters the combustion chamber. When the intake valve opens, the gas enters the combustion chamber, where it is ignited to power the vehicle.
