Fuel Gauge & Wiring Harness Operational Test

Unplug fuel tank sending unit connector. Turn ignition switch to ON position. If fuel gauge indicates EMPTY, go to next step. If fuel gauge does not indicate EMPTY, repair short circuit in wiring harness. See WIRING DIAGRAMS .
Connect a 12-volt, 3.4-watt test light between sending unit wiring harness connector terminals No. 2 and 3. See Fig 1. With ignition switch in ON position, test light should flash and gauge needle should move toward FULL. If test light does not flash and gauge needle does not move, check wiring harness for open circuit. Repair or replace as necessary. If wiring harness checks good, perform FUEL GAUGE RESISTANCE TEST.

Fig 1: Identifying Fuel Sending Unit Harness Connector Terminals