Why is my machine constantly running? Your unit has a smart chip inside that disables the pump automatically when the selected pressure setting is reached. Misplaced connections, loosen, and or cracked hoses can cause the unit to constantly run if not properly checked before using the unit. Related articles Can I run the unit for a long period of time? Can you hook this unit up to a hose? Does the unit shut off automatically? Why isn't any air coming out of the High Volume hose?