The affected vehicles were built with an incorrect flare fitting.
"The connection between the fuel hose and the fuel feed line might develop a leak or may completely disconnect," said NHTSA in its recall summary. "Leaking fuel in the presence of an ignition source increases the risk of a fire and if the fuel feed line disconnects, the vehicle would stall, increasing the risk of a crash."
Mercedes-Benz did not respond immediately to a query from Edmunds asking if there are any injuries, crashes, fires or fatalities linked to the recall.
The affected cars were built from June 4, 2014 to July 9, 2014.
Edmunds says: Owners of these cars should wait for their official recall notice and then schedule a service appointment. Those with an immediate concern should contact their dealer now.