Question: Suppose you had a failed right auxiliary electric pump, were able to start both engines, put both engines back to their principal main tanks for take-off, and later during the flight the rear-engine mechanical fuel pump fails. How can you keep running on both engines?
Answer: Just cross-connect both engines and turn the left-main electric pump on for the rest of the trip. In this configuration, the front engine will be drawing from the right main (unassisted by the electric pump) and the rear engine will receive fuel being pumped from the left main by that tank's electrical pump.
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