A group of students from the University of Purdue has replaced the fuel of the grass cutter with water. It seems that the use of water as a fuel is restricted to vehicles with high pressure systems. That is, in heavy machinery that is used in construction, in agriculture and in the forest, and not in cars.
The equipment of the hydraulic system should be plastic, stainless steel or ceramic and to remove minerals and impurities distilled water is used. All this makes the system more expensive than originally planned.