Check Fuel Level Sensor Unit And Pump (Main) Harness

Check continuity at following terminals.

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

Fig 2: Fuel Level Sensor Circuit Specifications
Courtesy of NISSAN MOTOR CO., U.S.A.
If the results of check is NG, replace fuel pump assembly. If the results of check is OK, replace fuel level sensor unit.