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Low Fuel Warning Light Sensor (RAV4, Sienna, Tacoma With Tachometer, Tundra & 4Runner)

  1. Remove fuel sending unit from gas tank. Using a jumper wire, connect negative battery terminal to fuel sending unit terminal No. 3. See Figure and Figure . Using another jumper wire, connect a 12-volt, 3.4-watt test light between positive battery terminal and fuel sending unit terminal No. 1.
  2. With sending unit float/sensor dry, test light should come on in about 40 seconds. With sending unit float/sensor submerged in gasoline or water, test light should turn off. If test light does not function as specified, replace fuel gauge sending unit.
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