When your truck is a Ford F650 or F750 outfitted with the Cummins ISB 6.7L engine and a 5-gallon DEF tank, not all DEF head units are created equal. The Ford F650/F750 5 Gallon Tank Cummins ISB 6.7L DEF Head Unit is designed specifically for that configuration—ensuring your emissions system receives accurate readings and correct dosing. Using a mismatched head can lead to warning lights, engine derates, and SCR (Selective Catalytic Reduction) faults that complicate your route.
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Continuously monitors DEF fluid level, temperature, and urea concentration to supply reliable data to the engine control module
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Regulates precise dosing of DEF into the exhaust stream to support proper NOx reduction by the SCR system
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Calibrated for a 5-gallon DEF system to match fluid dynamics and feedback requirements
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Helps prevent system faults, emissions warnings, and engine derates caused by sensor inaccuracies or drift
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Built to withstand rugged use: vibration, temperature swings, and exposure to the chemistry of DEF
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Direct replacement design minimizes downtime and simplifies service
Choosing the wrong DEF head—one meant for larger tanks or different calibration—can throw your emissions system out of balance. Installing the correct head for the 5-gallon setup restores calibration, ensures your SCR circuit works properly, and preserves vehicle reliability. Don’t let a small mismatch undermine your emissions system—match your head to your tank.