BMW 335 I 2008 Manual

Hello everyone, I'm asking for help from all the friends in the group. I need a manual for a 2008 BMW 335i Biturbo, 6-cylinder, because I can't figure out why the fuel pump isn't working. If I apply direct current to it, it works and the engine starts fine, but if I disconnect it, it doesn't work, and I want to check the wiring. Thanks in advance to everyone