Cummins 4328805 Urea Doser Pump Assembly

The Cummins 4328805 Doser Fluid Supply Module is a critical component of the Selective Catalytic Reduction (SCR) aftertreatment system. It integrates a pump, filter, and temperature sensor to deliver Diesel Exhaust Fluid (DEF) at controlled pressure and flow rates to the dosing valve. Designed for 24-volt electrical systems, the module operates within the EcoFit UA2 architecture to maintain emissions compliance across heavy-duty applications. Constructed with an aluminum alloy housing and engineering plastic components, the assembly weighs approximately 1.0 kg. It features quick-connect fluid ports for serviceability and is calibrated for a nominal operating pressure of 1.0 MPa with a flow capacity of 500 ml/min. The unit replaces Cummins OE part numbers 5303018 and 5289921, and corresponds to CES reference A042P115.