Strange, they should just be piezo elements like the beepers in the back of watches, but driven by a higher frequency, can't see why distilled water would not work.
For ultrasonics in my cars, I'm putting pits 1mm to 2mm deep done with a 1/16 drill bit at points of high airflow near the injectors. According to helmholtz resonator theory these should resonate in the ultrasonic and potentially break up large fuel droplets.
In a carbed or TBI motor, I'd look at putting them in the area above and below the throttle plate, as this is where flow should be fastest at small throttle openings.
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I remember The RoadWarrior..To understand who he was, you have to go back to another time..the world was powered by the black fuel & the desert sprouted great cities..Gone now, swept away..two mighty warrior tribes went to war & touched off a blaze which engulfed them all. Without fuel, they were nothing..thundering machines sputtered & stopped..Only those mobile enough to scavenge, brutal enough to pillage would survive. The gangs took over the highways, ready to wage war for a tank of juice
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