However, any ordinary electrolyzer cannot generate Brown's gas (the combination of diatomic oxygen, diatomic hydrogen and other high energy molecular variations) required for fuelling cars. Special 'common ducted' electrolysers are necessary for this. I found this article on Brown's gas and some other high tech stuff like oxyhydrogen, MagneGas and a couple of very cool videos on the potential of water fuel. You can check it out on http://brownsgas.wordpress.com/
The Scorpion - the first commercial water fuel car to be launched in fall of 2008
The following paragraph was taken from Statesman.com
"A unit on the back of the car splits water molecules and mixes the hydrogen with gasoline in a combination of 40 percent hydrogen and 60 percent gasoline, Maxwell said. And although the car still needs gasoline, the hydrogen consumes the carbon waste, which reduces emissions. A 1½-gallon tank of water on the back of the car powers the vehicle, along with gasoline, for 5,000 miles, Maxwell said. (The image of the Scorpion was taken from Crave)
Just to put that paragraph in even simpler terms, it's someting like this. First, electrolysis breaks up water into hydrogen and oxygen. Secondly, this hydrogen will be inducted through the air intake manifold and blends with gasoline at a ratio of 40% hydrogen : 60% gasoline. The Scorpion doesn't store hydrogen, instead it uses water fuel to produce the required amount of hydrogen as and when necessary. This is why the water for fuel system is called a 'Hydrogen on Demand' technology.
You can read a lot more about the water for fuel technology, it's history, founders, the indepth science, how you can save upto 60% of your gas bill etc. etc. at http://www.savegassaveearth.com/ This site also talks about some research done by the US Air Force, the US Navy and some comments by NASA on this technology
Find out more, or even place an order for a Scorpion for $150,000 at their website here. Or if you'd rather make a simpler and more affordable water fuel system at home for less than $150, see the official website of water4gas or Run your car on water