Noticable high pitched whine

At idle I hear this high pitched whine coming from the rear of the car. It leads me to believe it's the fuel pump but I'm not so sure. Is this normal? It's not exactly loud, but if you listen closely you can hear it. It sounds very similar to engine noise through the speakers, but at the moment there are no speakers in the back, so I eliminated that idea.

Its your rear mounted supercharger.............................


Its probably your fuel pump, if you have an upgraded one its deffinatly you fuel pump.

I concur