WARNING: This page is about a different car, the 2005 Nissan Quest. However, it is still accessible from the selected car via links, so may be relevant.
Check resistance between fuel level sensor unit and fuel pump connector terminals 2 and 5.
Fig 1: Terminal Reference Value Chart
Courtesy of NISSAN MOTOR CO., U.S.A.
Fig 2: Identifying Fuel Level Sensor Unit & Fuel Pump With Connector