Time fill stations do not need a fuel storage tank. They can refuel an entire vehicle fleet over an 8-12-hour period. This is the ideal solution for drivers who return to the same point each evening. Once their workday is over, they simply connect their vehicle to the dispenser at their regular parking space, without having to line up. This type of station also offers an excellent return on investment since it is less expensive than a fast-fill system.
Fast-fill stations can supply a tank full of CNG as fast as filling a diesel tank at a gas station. They have powerful compressors and a high-pressure fuel storage tank. These are the types of stations that you find along the road.