Keeping you Ready for the Road Ahead , Dorman Fuel Sender consists of an arm, float and a resistor that adjusts according to the float’s position. While overseeing the signal transmission, this heavy duty component operates the instrument cluster’s fuel level gauge. Don’t get caught with an empty fuel tank on the side of the road. With this direct replacement heavy duty fuel sender, you will know exactly how much fuel is in your tank. FleetPride is your First Click in Heavy Duty .