Have you cleaned the washer jets (by sticking a pin into the washer jet hole to clear any hardened residue)?
The washer pump is #6 in the diagram below...and the headlight washer pump is #3 in the diagram below for a 2011 750i.
The 2nd & 3rd pics shows how the main washer pump (#6) is on one side of the reservoir & the washer pump for the windshield (#3) is on the other side of the reservoir: