Japan Airlines explains Dreamliner fuel leak

Boeing 787 Dreamliner arrives from Boston at Narita airport in Japan on Jan. 9, 2013, after a fuel leak forced the jet to return to the terminal at Logan International Airport. Kyodo/AP

BOSTON Japan Airlines is giving more details about a fuel leak on one of its Boeing (BA) 787s that delayed a flight from Boston to Tokyo.

A spokeswoman said Wednesday one of four valves connecting the center and left main fuel tanks was open. That led to fuel flowing between those tanks to a surge tank near the wing tip and then out a vent, spilling about 40 gallons.

She says that valve was deactivated and the flight was cleared to depart later Tuesday. A more detailed inspection was scheduled in Tokyo.

The leak Tuesday was the second problem in two days for Japan Airlines at Boston Logan. A fire broke out in a battery pack in the belly of a different Boeing 787 on Monday, after passengers had exited.

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