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Well, a true venturi will not allow that to happen...... It has to do with Bernoilli's law (I think it's that one) that when air flows through a restriction, the velocity (speed of flow) goes up (makes sense, right?) and then the pressure goes down...... (Doesn't make sense..) That's the same principal that makes carbs work, even on turbo charged or supercharged engines....... It still sucks gas into the engine, not blow it back to tank.
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