Sounds like a fuel pump, if you remove the cargo liner, youll see a black plastic piece covering some metal (where you would access said pump) along the base of the back of the seats (whre they fold). Listen there, if the sound is coming from there, its the pump, it the sound comes from the engine ...

Hey all ! I have tried to search the problem from other volvo forums but it seems here is more volvo experts. :) I have this weird humming/whirring noise in my volvo now. I start the car the noise begins and wont stop until i shut down engine. It doesent matter am i driving or in park. And when i sh...