2. Check Fuel Level Sensor Power Supply Circuit

WARNING: This page is about a different car, the 2004 Infiniti M45. However, it is still accessible from the selected car via links, so may be relevant.

Disconnect "fuel level sensor unit and fuel pump" harness connector.

Fig 1: Identifying Fuel Level Sensor Unit And Fuel Pump Harness Connector
Courtesy of NISSAN MOTOR CO., U.S.A.
Turn ignition switch ON.
Check voltage between "fuel level sensor unit and fuel pump" terminal 5 and ground with CONSULT-II or a tester.

Fig 2: Checking Voltage Between Fuel Level Sensor Unit And Fuel Pump Terminal 5 & Ground
Courtesy of NISSAN MOTOR CO., U.S.A.

Voltage: Battery voltage

OK or NG

OK: GO TO 4. CHECK FUEL LEVEL SENSOR GROUND CIRCUIT FOR OPEN AND SHORT .
NG: GO TO 3.