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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 by heating with hot water or heat gun as shown in the figure.

Fig 1: Checking Resistance Between Terminals 4 And 5
Courtesy of NISSAN MOTOR CO., U.S.A.

Fig 2: Temperature And Resistance Specifications
Courtesy of NISSAN MOTOR CO., U.S.A.