How are CNG vehicles filled?
o In order to fill your vehicle, you need to go to a compressor station, the CNG equivalent of a gas station. Here there are two ways to fill your vehicle with CNG: § A fast fill provides for a quick and convenient way to refuel. However, due to the fact that this process is fast, there is a heat rise that occurs in the tank during the compression of the natural gas. Molecules spread out when they are hot, so once the tank has cooled there is a slight reduction in its volume due to the molecules taking up less space. Therefore you would have less than a full tank or 3600 psi. § A slow fill takes up to eight hours. This method allows for the complete filling of a tank. § Consumers can also have a household gas line that can refill their vehicle overnight.
