There are 2 owner-reported fuel system complaints for the 2005 Mercury Grand Marquisin NHTSA's database. These are unverified consumer reports and may not reflect confirmed defects.
STRONG ODOR OF GAS, MECHANIC FOUND A DEFECT IN THE FUEL INJECTOR RAIL. *TR
WHILE DRIVING 55 MPH VEHICLE RAN OVER A PIECE OF A TIRE TREAD, MEDIUM IN SIZE. THE HIGHWAY PATROL OFFICER INFORMED THE CONSUMER THAT THE VEHICLE WAS LEAKING FUEL ONTO THE ROAD. THE TREAD CAUSED A PUNCTURE IN THE FUEL TANK. VEHICLE WAS TOWED TO THE DEALER.*AK *BF
Complaints are unverified consumer reports submitted to NHTSA. A high complaint count may reflect vehicle popularity, not defect severity. Data sourced from NHTSA public records.
Data synced from NHTSA on Apr 26, 2026