Narrative:

During climb out at 1000 ft. AGL the left auxiliary fuel pump was selected to the off position. This resulted in an immediate loss of power in the left engine. The auxiliary pump was then selected back to the low position and the engine did not return to a normal power output. Engine failure after takeoff flow was performed and [advised ATC]. ZZZ tower cleared aircraft to land on runway xx. After landing and during the roll out; the left engine stopped running. The aircraft taxied to the ramp under the power of the right engine.

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Original NASA ASRS Text

Title: A Cessna 402 Captain reported a loss of engine power when reconfiguring the fuel boost pumps; necessitating an immediate return to the departure airport.

Narrative: During climb out at 1000 ft. AGL the left auxiliary fuel pump was selected to the off position. This resulted in an immediate loss of power in the left engine. The auxiliary pump was then selected back to the low position and the engine did not return to a normal power output. Engine failure after takeoff flow was performed and [Advised ATC]. ZZZ Tower cleared aircraft to land on Runway XX. After landing and during the roll out; the left engine stopped running. The aircraft taxied to the ramp under the power of the right engine.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.