1999 Mercury Grand Marquis Fuel system Problems
- Complaints
- 6about this part
- Share
- 4%of 164 total for the year
- Median mileage
- 78,002miles
- Trend
- Not enough dataFewer than 15 complaints, too few for a reliable trend.
NHTSA recorded 6 complaints about the fuel system of the 1999 Mercury Grand Marquis, 4% of the 164 complaints for this model year. Where a mileage was given, the median is 78,002 miles.
Fewer than 15 complaints name this part, so treat the figures as a rough indication only.
Example complaints
Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.
“During normal operation of my car, the check engine light came on and stayed on. I had the engine light codes read and it indicated that two cylinders were misfiring. I took the car to a service shop to have the spark plugs changed. I was told that the intake manifold had developed a crack which was allowing coolant fluid inside the manifold cavity and this is what was causing the cylinder misfire. The car is a 1999 Mercury Grand Marquis with a 4.6 ltr. Engine. The intake manifold is made of a plastic material and tends to crack next to the thermostat housing. …”
NHTSA complaint #10324884, filed 2010-04, 100,250 miles“Experienced fuel pump failure in vehicle while crossing desert en route to destination, without any warning notice, causing unnecessary delay, expense,anxiety, & frustration.”
NHTSA complaint #10136796, filed 2005-09, 37,710 miles“1999 Mercury Grand Marquis ls 4.6l (1) drove vehicle in a normal way, commuting from home to work daily. No speeding. In the mornings properly wait for 10 minutes to warm up the vehicle's engine prior to driving. Kept proper maintenance schedule by ford/Mercury dealership. Never brought up to my attention of the possible default this part may cause down the line. Had a complete coolant flush for radiator. Replaced with new coolant. (2) misfire in cylinders 6 + 2. Check engine light on. Small amounts of coolant leakage onto top part of engine, profusely around the spark plug chambers. …”
NHTSA complaint #10211441, filed 2007-12, 78,002 miles“Driving over safety warning strips on the side of the road caused fuel shut off system to stall, which may have caused a crash. Dealer said it was a common problem.”
NHTSA complaint #860567, filed 2000-04Related service bulletins
- 10026401May 15, 2008Ford/lincoln mercury: certain 1992-2001 model year crown victoria, grand marquis, and town car vehicles registered in the states of wisconsin and connecticut upgrade…
Fuel system: other model years
| Year | Complaints | Share of year |
|---|---|---|
| 2011 | 1 | 11% |
| 2010 | 1 | 4% |
| 2009 | 3 | 12% |
| 2008 | 4 | 5% |
| 2007 | 5 | 5% |
| 2006 | 13 | 9% |
| 2005 | 2 | 0% |
| 2004 | 6 | 2% |
| 2003 | 10 | 3% |
| 2002 | 4 | 5% |
| 2001 | 5 | 3% |
| 2000 | 8 | 5% |
| 1999 | 6 | 4% |
| 1998 | 8 | 6% |
| 1997 | 32 | 10% |
| 1996 | 21 | 9% |
| 1995 | 8 | 4% |
| 1994 | 6 | 4% |
| 1993 | 6 | 4% |
| 1992 | 20 | 8% |
| 1991 | 4 | 5% |
| 1990 | 2 | 4% |
| 1989 | 5 | 9% |
| 1988 | 5 | 7% |
| 1987 | 2 | 5% |
| 1985 | 2 | 10% |
| 1984 | 2 | 13% |
| 1983 | 1 | 14% |
Other parts of the 1999 Mercury Grand Marquis
26 complaintsExterior lighting
20 complaintsSuspension
18 complaintsSteering
16 complaintsElectrical system
15 complaintsTires
12 complaintsTransmission and drivetrain
12 complaintsVehicle speed control
12 complaintsBrakes
9 complaintsEngine
7 complaintsSeat belts
7 complaintsBody and structure
7 complaints
← All problems reported for the 1999 Mercury Grand Marquis
About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 31, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate.
To check a specific vehicle for open recalls, use its VIN at nhtsa.gov/recalls. Methodology