Liebherr Fault Code
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Engine Power Sag / Hard Knocking
System
Fuel System
Symptom
Engine Power Sag / Hard Knocking
Diagnosis & fix steps
LOGIC: Low Pressure Fuel System Pressure Below Minimum Limit.
ACTION: Replace primary fuel filter and water separator elements. Check electric fuel lift pump delivery pressure and inspect suction lines for air leaks.
Red Seal field insights
Fuel Starvation: Low supply pressure starves high-pressure pump plungers, preventing the common rail from meeting full injection volume under heavy drilling.
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