Version, fuel hoses with integrated unlocking facility:

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2006 BMW X5, 2006 BMW X3, 2005 BMW X5, 2005 BMW X3, and 2004 BMW X5. However, it is still accessible from the selected car via links, so may be relevant.

Press fuel hose (1) downwards and keep pressed.

Fig 1: Pressing Fuel Hose Downwards

Courtesy of BMW OF NORTH AMERICA, INC.

Press unlocking ring (2) upwards, keep pressed and detach fuel hose (1).

Fig 2: Detaching Fuel Hose

Courtesy of BMW OF NORTH AMERICA, INC.

Installation:

Check O-ring in fuel hose and sealing surfaces on fuel lines for damage; replace components if necessary.

Coat O-ring for assembly with anti-friction agent.