Cessna 402/402C/B379 Businessliner/Utiliner
Flight Crew Air Transport Pilot (ATP); Flight Crew Multiengine; Flight Crew Instrument
Troubleshooting; Distraction; Time Pressure
Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural Published Material / Policy; Inflight Event / Encounter Fuel Issue
Air Traffic Control Provided Assistance; Flight Crew Returned To Departure Airport; Flight Crew Landed in Emergency Condition
Human Factors; Aircraft
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.
A Cessna 402 Captain reported a loss of engine power when reconfiguring the fuel boost pumps; necessitating an immediate return to the departure airport.