<p>Japan Airlines said that the Boeing 787 Dreamliner jet under investigation following a fuel leak at Boston airport last week, leaked fuel during tests in Japan on Sunday (January 13).</p><br /><p>An open valve on the aircraft caused fuel to leak from a nozzle on the left wing used to remove fuel, a company spokeswoman said.</p><br /><p>The jet was out of service after spilling about 40 gallons (roughly 150 liters) of fuel onto the airport taxiway in Boston due to a separate valve-related problem.</p><br /><p>In Boston, a different valve on the plane opened, causing fuel to flow from the center tank to the left main tank.</p><br /><p>The causes of both incidents are unknown, and there is no timetable for the plane to return to service, the JAL spokeswoman added.</p><br /><p>The 787 represents the boldest bet Boeing has made on a new plane in more than a decade, and because the aircraft required billions to develop, much of the company's financial performance is riding on its success.</p><br /><p>Boeing is trying to double production to 10 jets a month this year to cash in on nearly 800 orders.</p><br /><p>-Reuters</p>
