Fuel Pressure Release
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2003 Nissan Xterra, 2003 Nissan Sentra, 2003 Nissan Pathfinder, 2003 Nissan Murano, and 2003 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.
To relieve fuel system pressure, remove fuel pump fuse. Start engine, and allow it to run until it stalls. Crank engine 2 or 3 more times to verify all pressure has dissipated.