Modern emissions systems demand precision, and the DEF (Diesel Exhaust Fluid) circuit is one of the most critical subsystems in that chain. For Ford trucks built on F-650 / F-750 chassis using the Cummins ISB 6.7L engine and a 5-gallon DEF tank, the Cummins ISB 6.7L DEF Head Unit is the component that ties everything together. A malfunction here can lead to costly error codes, derates, or a non-compliant emissions state exactly when you least expect it.
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Continuously monitors the DEF system’s vital metrics—fluid level, temperature, and urea concentration—and sends accurate feedback to the engine control module
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Regulates the precise dosing of DEF into the exhaust stream so the SCR (Selective Catalytic Reduction) system can convert NOx emissions effectively
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Designed to match OEM tolerances for Ford F650 / F750 applications with the 5-gallon DEF tank and Cummins ISB 6.7L setup
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Helps to prevent fault codes, emission warnings, and engine derates triggered by misread sensors or degraded units
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Built to handle vibration, temperature swings, and the corrosive effects of DEF fluid
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Offers ease of field replacement, reducing downtime and getting your truck back in service
Because many fleet operators treat the DEF head as a “set it and forget it” component, failures often come unexpectedly—and often at the worst possible moment. Installing the correct DEF head (tuned for your 5-gallon tank and Cummins ISB 6.7L engine) ensures your emissions system stays honest, stable, and complaint under all conditions. Don’t let a failing sensor be the weak link in your operation—stay ahead with the right replacement.























































































































































































































































































