It depends on the year of the Dodge Neon. I would recommend buying a service manual at a local auto store. That way you would also have the instructions on how to replace and service the pump sensor.
it is located under the car next to the filter on the neon right next to the motor but its so little you have to look in the middle but under the car and the pump is not plastic it is not big but its made alittle different than other cars