Fuel Level Warning Switch Test

Disconnect fuel gauge sending unit harness connector. Connect a jumper wire between terminals No. 1 and 2. See Fig 1. If fuel level warning light glows, go to next step. If light does not operate, check bulb and wiring between fuel gauge sending unit. Repair as necessary.
Remove fuel gauge sending unit. See FUEL GAUGE SENDING UNIT under REMOVAL & INSTALLATION. Apply a 12-volt power source, through a 3.4-watt test bulb, to terminal No. 2. See Fig 1. Connect terminal No. 1 to ground.
After a short time, test bulb should light. Submerge sending unit in a container of fuel. Test bulb should go out. If operation is not as specified, replace fuel gauge sending unit.

Fig 1: Testing Fuel Level Warning Switch