Check Fuel Level Sensor Unit

WARNING: This page is about a different car, the 2003 Infiniti M45. However, it is still accessible from the selected car via links, so may be relevant.

For removal, refer to "FUEL LEVEL SENSOR UNIT, FUEL FILTER AND FUEL PUMP ASSEMBLY ".
Check the resistance between terminals 5 and 6.

Fig 1: Checking Fuel Level Sensor Unit
Courtesy of NISSAN MOTOR CO., U.S.A.

Fig 2: Terminal Resistance And Float Position Table
Courtesy of NISSAN MOTOR CO., U.S.A.