http://www.hydrogenfuelcell-kits.com/
We can talk about different conversions on this gasoline to water subject. Actually what we are discussing is a very simple conversion of water to an electrical source and consists of two things.

The electrical source and the throttle circuit that will give you the energy to the reactor, and therefore enables the water to be turned into hydrogen. The water goes through the process of becoming hydrogen and then mixes with the oxygen and forms HHO.

After this has happened the HHO is then passed into the engine by the injector pump or the carburetor, depending on which system you happen to have. A lot of the products presently on the market use your battery as the power source and will allow the water to vaporize and become a powerful gas.

This product allows the creation of your own unit that is going to produce the power that is needed. By using this route, you have no need to use the battery nor other parts of your car to complete the setup.

You could say it is the same as a steam engine except for the reaction chamber being much smaller and contained.