Re: Running my gypsy bus off of water!
This thread is weird.
A 'hydrogen generator' is another name for a hydrogen electrolysis system that does not transfer the gases produced to a storage vessel. Unless you have the right materials and knowledge, you just do not want to store hydrogen. It can be fatal with no warning whatsoever and unfortunately is far too often fatal even with well tested safety equipment and knowledgeable users.
These vehicle based 'hydrogen generators' run off the alternator and create a constant stream of fuel for whatever system you are using. Alternators with a heavy load (like the immense one required by a 'hydrogen generator') create higher resistance for the engine and of course drive up fuel consumption. The loss of fuel in creating this stream of hydrogen is not recovered in improved fuel efficiency. In fact the energy loss in converting energy to different forms is significant. If you have an alternator that runs as if it has max load at all times this could be seen as a fuel saver, but not as effective as a new alternator....
It would be as practical as using the engines water pump to power a water-wheel that adds power to the drive-train, or mounting a windmill on the roof for the same function. It's just silly.
BTW The most common use for hydrogen electrolysis is to isolate hydrogen for lab systems, ceramics, rocket fuel, etc. It is a highly inefficient and risky process.