I have 2004 Nissan Maxima 3.5 SE, and I am having a problem with something running in the engine compartment. Even after the car is off and the key is removed. It sounds like a fan or something like that, but it is coming from somewhere near the intake and timing chain area. Possibly something on the fire wall. Whatever it is, its draining my battery. If anyone can help, it would be greatly appreciated!

 

Anti-lock brake pump