The working principle of the water 4 gas system is very simple. What you need to do in order to have this water 4 gas system incorporated into your vehicle is that you have to build a home made kit of the water 4 gas system. Once you built the system you now put it into the proper place in the car and then connect it with the battery. Now, you are ready to save a handsome amount of money by not stopping frequently at the gas station to fill up the car tank with gasoline. The price of the gasoline is not going to come down, so why not give it a try to the water 4 gas.