Hi. I'm sure this isn't a fault, I just can't figure out what the hell
it is. It's really bugging me.

I have a 2001 Maxima, auto. And when I turn the engine off, there are 4
or 5 sounds in a row that sound like some sort of pump. At first I
though it was the aerial automaticly retracting.

The other day I also noticed it as I was slowly backing in somewhere,
while the engine was still running.

Does anyone know exactly what this is? The oil pump or something?

Thanks, Justin.