Consistent DEF Supply: Cummins B6.7 / ISL DEF Doser Pump (2021–2024), OEM 5509448RX
What is it?
The Cummins DEF Doser Pump (OEM 5509448RX) ensures precise Diesel Exhaust Fluid (DEF) delivery to the aftertreatment system in B6.7 and ISL engines from 2021 to 2024. It maintains DEF pressure and flow under a wide range of operating conditions, supporting optimal system response and emission control.
Why choose this OEM DEF Doser Pump?
Specifically matched to Cummins control systems, this pump integrates directly into your vehicle’s existing DEF network—no extra setup needed. Opting for the OEM component helps avoid dosing inconsistencies, DEF-related warnings, or limp-mode events that often occur with generic alternatives.
Key Benefits
✅ Direct OEM fit for Cummins B6.7 and ISL engines (2021–2024)
✅ Reliable DEF pressure and flow for consistent system performance
✅ Built for durability—handles thermal stress, vibration, and prolonged operation
✅ Helps prevent DEF system alerts and ensures operational continuity
✅ Supports seamless operation across varied duty cycles
Applications
Ideal for modern work trucks, tractors, RVs, and equipment powered by Cummins B6.7 or ISL engines. Ensures dependable DEF delivery during high-demand, idle-heavy, and high-load operations.
Installation Notes
Start by powering down the vehicle and relieving pressure in the DEF line. Disconnect the existing pump and inspect fittings for cleanliness. Install the OEM 5509448RX using correct seals and torque, then reconnect all lines and wiring. Once installed, revive system power, clear any fault codes, and verify DEF flow using diagnostic tools.
Final Thoughts
If your Cummins-powered vehicle is showing signs of poor DEF supply, dosing errors, or SCR warnings, this OEM DEF Doser Pump provides a precise and dependable fix. Made to meet factory-standard performance and available now at Tamerx—ready to keep your system flowing smoothly.