An engine with a reported lack of power (LOP) condition evidently caused by fuel starvation is being diagnosed. The specified maximum inlet restriction on the primary side of the fuel transfer pump is 7-inches HG and the circuit tests at exactly this value. Technician A says that the LOP condition is almost certainly caused by a plugged primary filter and the first step should be to change it. Technician B says that the primary side of the fuel subsystem is not responsible because it still tests within specification. Who is correct?

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The Answer of An engine with a reported lack of power (LOP) condition evidently caused by fuel starvation is being diagnosed. The specified maximum inlet restriction on the primary side of the fuel transfer pump is 7-inches HG and the circuit tests at exactly this value. Technician A says that the LOP condition is almost certainly caused by a plugged primary filter and the first step should be to change it. Technician B says that the primary side of the fuel subsystem is not responsible because it still tests within specification. Who is correct?

An Engine with a Reported Lack of Power (LOP) Condition