I hope you mean by Switching it on your talking about an arming switch. If you leave it 'on' and it is spraying, you will fill your intake with liquid nitrous, empty your tank and most likely cause an explosion from the resulting nitrous backfire when you try to start the car later. Maybe you should reconsider installing/using nitrous if you don't understand what you are doing. If you read the owners manual for the kit, it can be VERY informative.
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