Why You Should Install A Flashback Arrestor
A Flashback Arrestor is just a safety device but it has an important purpose. I would recommend that you use either a flashback arrestor or a bubbler with your hho system. In case of a backfire (flashback) then using one of these devices is what will protect your generator from blowing up. You definitely would not want that to happen while you are under the hood with it.
The Water4Gas plans say that if you use a long hose from the generator to the intake that your generator will be safe from flashback. I’m not sure that I trust that idea and it never hurts to make a little effort towards safety.