A. As the engine is started, the pressure from the saturated liquid within the tank pushes liquid natural gas through the liquid line, the fuel supply hand valve and excess flow valve up to the heat exchanger.

B. Once the fuel enters the heat exchanger, it is warmed up by the circulating engine coolant. The heat from the engine coolant causes the liquid natural gas to boil and vaporize.

C. All natural gas engines require natural gas to be of a vapor form and within a specified pressure range. The liquid natural gas begins to form a vapor and increases the pressure within the tank therefore eliminating the need for a fuel pump.

D. For safety, if the fuel line should break or leak excessively, the excess flow valve will sense an abnormally large rate of fuel flowing past it and will close off to eliminate emptying all of the remaining fuel from the tank.