Ford Motor Co. is recalling 411,205 2010-2011 model-year Ford Fusion and Mercury Milan vehicles in the U.S. to address a potential fuel tank problem that poses a fire risk, the company said.

Some of these vehicles might have a canister purge valve that doesn’t work properly, causing internal pressure changes inside the fuel tank, Ford said. Repeated pressure changes inside the tank could result in a crack on the top of the tank, possibly allowing fuel to leak. A fuel leak in the presence of an ignition source can lead to a fire.

Ford noted, however, it isn’t aware of any accidents, injuries or fires related to this condition.

The recall covers vehicles built at Hermosillo Assembly Plant from July 21, 2008, through March 4, 2011.

A total of 451,865 vehicles might be affected in North America, including 33,605 in Canada and 7,055 in Mexico, Ford said.

Dealers will update the powertrain control module software, inspect the canister purge valve and fuel tank for leaks and replace if necessary. There will be no charge for these services.