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Fuel Tank Temperature Sensor

Remove fuel level sensor unit.
Check resistance between fuel level sensor unit and fuel pump terminals 4 and 5, see Fig 1, by heating with hot water or heat gun as shown in Fig 2.

Fig 1: Identifying FTT Sensor Testing Specifications

Courtesy of NISSAN MOTOR CO., U.S.A.

Fig 2: Testing Fuel Level Sensor Unit Resistance

Courtesy of NISSAN MOTOR CO., U.S.A.