There are 5 owner-reported fuel system complaints for the 2000 Mercury Grand Marquisin NHTSA's database. These are unverified consumer reports and may not reflect confirmed defects.
REPLACEMENT AIRTEX FUEL PUMP (MODEL E2272S) DETERMINED TO BE LEAKING GASOLINE FROM WHERE THE ELECTRICAL WIRES PASS THROUGH THE NYLON/PLASTIC CONNECTOR BLOCK ASSEMBLY AND/OR FROM THE JUNCTION OF THE NYLON/PLASTIC WIRE BLOCK ASSEMBLY AND THE FUEL PUMPS METAL HOUSING. FUEL PUMP INSTALLED IN THE VEHICLE ON OR ABOUT 5/31/2012 @ 79,353 MILES. LEAK NOT NOTICED/DETECTED/REPORTED UNTIL 7/23/2014 @ 92,958 MILES.
I FILLED THE FUEL TANK. SHORTLY I NOTICED THAT THE FUEL GAUGE LEVEL WAS RAPIDLY DROPPING. I STOPPED THE VEHICLE ON THE SIDE OF THE INTERSTATE. FUEL WAS POURING FROM BENEATH THE VEHICLE. A LARGE PUDDLE OF FUEL COLLECTED UNDER THE VEHICLE. I HAD THE VEHICLE TOWED. THE FUEL PUMP HAD STUCK AT 65 PSI AND RUPTURED THE FUEL LINE. I HAD THE FUEL LINE AND PUMP, ALONG WITH THE FILTER REPLACED. *TR
THE FUEL TANK WAS KNOWN TO EXPLODE DURING IMPACT CRASHES.*JB *TT
WHILE ROUTING TIRE NOTICED GAS LEAKING FROM FILLER PIPE.IN A REAR END ACCIDENT IT COULD OF CAUSE A FIRE. CONTACTED DEALER. REPLACED SEAL.*AK
FUEL LINES WOULD RATTLE AGAINST UNDERSIDE OF VEHICLE WHILE DRIVING. CLAMPS ON FUEL LINES WOULD LOOSEN UP AFTER BEING TIGHTENED BY MECHANIC.*AK
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