Heater, Fuel: Description
WARNING: This page is about a different car, the 2017 Jeep Cherokee. However, it is still accessible from the selected car via links, so may be relevant.
The fuel heater/fuel temperature sensor (1) is a combination sensor located in the fuel filter/water separator housing assembly and is located on the left side rear of the vehicle by the gas tank. The fuel heater is not a serviceable item. If diagnosis has lead you to replace the fuel heater then the whole fuel filter/water separator assembly must be replaced.