To someone with bogus invention like this one. There is no specific mention of material used in his electrolysis. I bet the patent office doesn't have an engineer to verify whether or not the invention is working. For example like the flaw, it's related to the problem that Coast to Coast tester mentionned earlier last week, he was having problem with Oxygen Sensor and "Engine light came on."
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The operation of the vehicle's oxygen sensor needs to be adjusted to take into account the additional oxygen that is added to the fuel system from the electrolyzer. Normally, if the oxygen sensor senses more oxygen, the vehicle's computer would determine that the engine is running lean and open up the fuel injectors to a richer fuel mixture. This is undesirable and would cause poor fuel economy: