My brother in law worked on Hydrogen development at Ford years back. Another friend was a pipefitter. Outfitting a hydrogen system at Ford HQ was a multi-year project for him.
Another waste of time and resources
Hydrogen works better in the rotary engines of Mazda than in the piston engines.
There was also Stanley Meyers hydrogen from water car, that no one else could get to work. Recently I read another successful, ready to test 'water' car, that alluded to the use of 'heavy', irradiated water to extract the hydrogen from. So there's that.