According to a filing posted this afternoon on NTHSA's website, a coolant line and a fuel line can rub against each other, which can cause the fuel line to become disconnected. Porsche will install a new, presumably more robust version of the fuel line on all 1,232 cars being recalled.
Porsche says that the first leak was reported just six days after the 911 went on sale in early February.
The affected vehicles were built between October 26, 2011 and January 24, 2012, although the recall won't begin until next month. Concerned owners can contact Porsche at 1-800-767-7243, or they can wait until April when the recall begins.