The fuel gauge on your Jeep is powered by the fuel sensor relay. If the fuel gauge in your Jeep stops working, the relay has gone bad and needs to be replaced. The fuel sensor relay is responsible for powering the sensors that, in turn, relay information to your fuel gauge.
The fuel sensor relay is located inside the main relay panel on your Jeep. However, the exact location of the relay inside the relay panel may vary depending on the year and model of your Jeep.
Lift your Jeep’s hood and remove the negative battery cable.