x5 fuelsystem question

[willnc]

hi guys i am willnc from south africa the nc stands for norther cape the region i live in. i own a 2004 x5 30d, my first quest is about the fuel system on the x5.we cant seem to get enough fuel pressure at the injectors.the x5 was running fine untill i lifted the front end, the allarm went off,bmw reprogrammed the key and checked the x5 on their computer.the starter turns,it some times starts for a few seconds and die.if anyone have some information,diagrams for the fuel system, where and what to check.