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(888) 312-8812 Login SignupThe Freightliner Diesel Exhaust Fluid Header manages fluid pickup and signal communication inside the DEF tank. As DEF is drawn from the tank, the header routes fluid toward the dosing system while sending level and temperature information to vehicle controls. This interaction allows the emissions system to regulate dosing based on operating conditions. The Freightliner 04-33656-000 works continuously whenever the aftertreatment system is active. Its configuration supports consistent DEF delivery without relying on mechanical valves.
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