I have never heard my 75 Z prime the pump on the "on" position, i usually hook power directly to the pump when it has sat long for a couple of months or years, just to run fuel thru the system. It usually cranks up right away especially after it has been running, but let's say after a couple of days of just sitting around not running, it takes about two to three cranks before firing up, but the pump never makes noise when just left on the "on" position.