Fuel Gauge: M30

To check power source, turn ignition on. Check voltage between terminal No. 14 and ground. See Fig 1 . If battery voltage is present, go to step 3).
If battery voltage is not present, check for blown fuse or fusible link. Check harness continuity between battery terminal and instrument cluster. Check battery circuit from ignition switch and relay. See appropriate chassis wiring diagram in WIRING DIAGRAMS .
Turn ignition on. Connect a jumper wire with a 3.4 watt light bulb between fuel gauge terminal "B" and ground. If gauge needle does not move smoothly from EMPTY to FULL, replace fuel gauge. If needle moves smoothly from EMPTY to FULL, check wire continuity between terminal No. 16 and ground.
If continuity is not present, repair or replace wire harness between instrument cluster and fuel tank sending unit. If continuity exists, test fuel tank sending unit. See FUEL TANK SENDING UNIT under TESTING.

Fig 1: Rear View Of Instrument Cluster (M30)

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