Cummins QSB 6.7L, ISB 6.7L Doser DEF Pump 2021-2024: OEM 5273338RX

Stay Emissions Compliant – Cummins QSB/ISB 6.7L Doser DEF Pump OEM 5273338RX

What is it?
The Cummins QSB 6.7L, ISB 6.7L Doser DEF Pump (OEM 5273338RX) is a genuine OEM remanufactured component that supplies Diesel Exhaust Fluid (DEF) to the Selective Catalytic Reduction (SCR) system. Designed for 2021–2024 engine models, this pump ensures accurate DEF delivery to help reduce NOx emissions and maintain EPA compliance.

Why Choose Cummins Doser DEF Pump – OEM 5273338RX
This DEF pump is remanufactured by Cummins to meet original performance standards. It’s built to handle extreme conditions and resist DEF crystallization, providing reliable operation and a precise fit for late-model QSB and ISB 6.7L engines. Choosing OEM means fewer issues, better integration, and trusted emissions control.

Key Benefits:
✅ Accurate DEF Delivery – Optimizes SCR function and reduces harmful NOx emissions
✅ OEM-Remanufactured Quality – Built to Cummins' strict specifications for reliable performance
✅ Direct Fitment – No modifications required for QSB and ISB 6.7L engines from 2021–2024
✅ Resistant to DEF Crystallization – Durable internal components reduce clogging and wear
✅ Prevents Derates and Fault Codes – Keeps your emissions system running smoothly and warning-light free

Applications
The OEM 5273338RX Doser DEF Pump is engineered for Cummins QSB 6.7L and ISB 6.7L diesel engines built between 2021 and 2024. These engines are widely used in commercial trucks, buses, and off-road equipment, all of which depend on precise emissions control for optimal operation and regulatory compliance.

Installation Notes
Before installation, ensure the system is depressurized and the battery is disconnected. Remove the old pump carefully, inspect DEF lines for contamination, and flush the system if necessary. Install the new unit using fresh gaskets and torque hardware to factory specs. Recalibrate the system and clear any stored fault codes with diagnostic tools.

Final Thoughts
A failing DEF pump can cripple your engine’s performance and lead to downtime. Trust the Cummins QSB/ISB 6.7L Doser DEF Pump OEM 5273338RX to keep your emissions system working flawlessly. Available now at Tamerx—your source for reliable, OEM-grade diesel solutions.