0444042009 2008-2018 Genuine Bosch Mack D11/D13 DEF Pump

2008-2018 Genuine Bosch Mack D11/D13 DEF Pump — Function and Service Importance This DEF pump builds and holds the pressure the dosing system meters from — the supply module that draws diesel exhaust fluid from the tank, pressurizes the line to the doser, and runs the purge cycle that protects the circuit from freezing crystals at shutdown. Why this DEF pump matters: The doser can only meter what this pump delivers: pressure-build faults, crystals, and failed purge cycles all land here, and because DEF freezes and crystallizes, the pump’s filters, heaters, and purge behavior are as much the part as its…