Everyone wants to claim there is a great conspiracy to prevent Hydrogen use in an Internal combustion engine as a wide spread motor fuel. It is not so - it is a logistics nightmare of safety, design, balance of use and proportion to potable water for consumption of animal and plant life on the planet.

First, putting that above aside, you need to get enough of the gas to feed the engine for the size. Second, since it's best ratio is around 32 to1, you need to pack enough air in to get a good bang for the buck. Third, since Hydrogen is such a small diatomic atom, it can get right past the compression rings and collect in the crankcase, where it won't explode, it will just light the oil spray in the engine on fire. That is not a problem in any dangerous way, it just leaves a coke pile in the lifter valley eventually. Fourth to make enough Hydrogen to power a Chevy 350 the Hydrogen generator needed is sizeable. That would be quite a bit of DC power needed to make that much gas per minute, and that does not mention the speed of the water-based fuel stock consumption that needs to happen to to make it all keep going. Finally since when Hydrogen burns it turns back to water vapor, - steam - you need an extra hot spark and extra tough spark plug and ignition system to take that kind of hot spark. (A major spark plug manufacturer has patented one by the way)

Since this is the only fuel that can be re-used, one must minimize fuel loss by recapturing it. Sounds crazy to most of you - because you do not think like HYDROGEN BURNS - back to water. The other two issues are condensation at the right temperature near a road surface by a road-full of cars; that would create a fog trail, and black ice creation in sub-freezing environment from water dripping from exhaust pipes. The biggest question is to how much of that water based liquid depletes liquid levels of the worlds bodies of water. Previously the Earth had huge reserves of ice-packs at the polar regions - and they are melting now and the seas are rising - so putting a lot of it in fuel tanks would help with the mechanical issue of rising seas; however the temperature of the seas is what largely controls the weather.

Mankind just does not know enough (or wants to believe the reality of any greenhouse effect caused by Carbon Dioxide) to even begin to wonder how fast any abrupt down turn in fossil fuel burning will impact the planet that would tend to go more Oxygen-Rich and pollutant free.

One thing is for sure, without comprehensive - SMART laws to address the use of any water based liquid as a fuel, mankind will head to catastrophe and even - yes - War faster than anyone or any Bovine can pass gas.

Putting all that aside for a moment, our sensor technology we now use to control engines, is decidedly carbon based. That is the sensors measure exhaust gases expecting carbon to be a component as a standard of the exhaust to use to measure. While a wide band oxygen sensor can measure the exhaust gases from a more pure Hydrogen burning engine, it needs an exhaust gas temperature probe to do so accurately, and there lies a major rub - an accurate exhaust gas temperature reading system in a wide and varied ambient temperature which will cause the exhaust gas to fluctuate widely.

Without explaining how, needless to say we have considered all of this. It ain't rocket science, but it is harder than you think.