I get something like that, an incredibly high pitched note (I wouldn't describe it as a whine though) from the back of the car, and it's hardly noticeable... except now I know it's there I can hear it all the time. Very annoying.
I get that nasty high pitched noise, on learning that the airbag module was in the back somewhere I put it down to that. Haven't got near to fixing it, wanted to see if the pitch/volume changed if I ever get the airbag warning light out.
Never heard the fuel pump
but the car keeps pulling in where there are those racks of big rubber hoses and a machine with numbers flashing fast so I'm sure it's there!