Sometimes when driving lately, I can hear a loud persistent whine coming from the rear of my Accord. I can hear it even when I'm stopped at a red light, and for about 10 seconds after I shut the car off. Seems to be coming from the left rear wheel. I have disc brakes in the front, drums in the rear. Drives fine otherwise. What would cause this?

it does it even when stopped, so that's the fuel pump whining, it's the only thing back there that can make noise with car shut off