It had a little led light I installed in the dash that came on when it was spraying. Then you'd know if it malfunctioned because light wouldn't come on. It only came on under hard acceleration, but must've sprayed quite a bit if volume, because it would rarely last a full tank if gas. Unsure the tank size, but it was the factory windshield washer tank repurposed, probably about a gallon and a half.sounds like you had meth flowing all the time, these cars really don't need meth flowing unless they are above the 14lbs of boost stock.