NATHAN'S BMW WORKSHOP 

i have this same problem with my 06 525i. i have tried to default code it with NCS expert, but still no joy. i either haven't selected the right unit from drop down menu or i need to change the vin on the head unit(which came from an 08 530 wagon) to make it native to my vin. still looking for guidance on this cant seem to get anyone that wants to help with out acting like a stealer-ship. i realize time is money . (that's why i invest my own time btw).

got a pump it wasn't what I was supposed to get, but enough to test bad pump theory, it does prime when I open the door let alone key in ignition. Im gonna wait for my new pump to get here, but im confident it will fix no start issue...then.well see. lol