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If you use a toggle switch, hook it to the “on” side of the ignition. When you turn the ignition switch off, no more power to pump, it shuts off and won’t keep pumping. I had to add a fuel pressure regulator from Holley because my pump is a 6 volt, 5-8 lbs of pressure. The model 94 carb doesn’t need much pressure, mine is set at 3 lbs. I don’t use the mechanical pump.