Fill your car with water and drive
Now drivers will be able to run their cars on water and stop worrying about high fuel costs. Now the fuelless engine has been invented. This engine will just take water and turn it into a gas called hydrogen. This gas will then power the car in the same way as gasoline does so you can run your car on water.
The water engine is not an extraordinary engine. It is the ordinary engine we see everyday that has been fitted with a kit that works through the process of electrolysis to produce hydrogen gas. You will not have to make any other modification to your engine to make the technology work.