Can you hear if the fuel pump is operating?
There is a fuel pump relay (K96 - relay panel behind glove compartment) that is operated by the ECM and the pump should operate as long as the ignition key is in the start position and then the pump will continue to run once the engine starts.
Also check if the fuel pump fuse (N52 engine - rear fuse holder fuse F50) is OK or not.
Here's the BMW E60/E61 2004-10 – Fuel Injection MSV70, MSV80 (N52 Engine) section from the service manual that may help to find out what's happening
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