One problem related to other fuel system tank assembly has been reported for the 2011 Mercury Grand Marquis. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2011 Mercury Grand Marquis based on all problems reported for the 2011 Grand Marquis.
Driving on freeway with dash display indicating 60 miles remaining on fuel supply when car ran out of fuel. Tank totally empty dash display still indicated 60 miles before empty. Fuel gage has been regularly deceitful.