Hi Moci and welcome to the Ford Fusion Club. So from your description, it would seem to be leaking while under higher pressures (while turning the wheel). You will need to isolate the area of the leak and replace whichever components are leaking.Not sure what issue is but only leaks, when turning the wheel any help is appreciated thanks. Have a video will post soon as I get a chance.
Let us know how you make out and good luck.