To unlock fuel line:
WARNING: This page is about a different car, the 2003 BMW X5, 2002 BMW X5, 2001 BMW X5, and 2000 BMW X5. However, it is still accessible from the selected car via links, so may be relevant.
Press fuel line (1) downwards and keep pressed.
Press unlocking ring (2) upwards, keep pressed and disconnect fuel line (1).
Disconnect fuel line (1).
Release clamp (2).
Detach hose (3).
Release nuts.
Remove both retaining brackets (1 and 2).
Pull out injection pipe (3) with fuel injectors towards top.
Remove injection pipe with fuel injectors.
Lever out fuses (1).
Pull fuel injectors (2) out of injection pipe.