Originally Posted by
Steve Jr
It seems ( from my understanding ), that he is hearing that humming noise, without the car running...IDK
Right! It should only be running when engine is running, not when the key is on the "ON" position. I think I get the same thing, that the pump runs when the key is ON but engine is not running. Will double check tomorrow morning. Not that I am worried about it, but it is always nice to understand how these things work ;-)