One problem related to other fuel system pump has been reported for the 1999 Mercury Grand Marquis. The most recently reported issues are listed below.
The passengers side seat beat comes undone at times and the speed sensor works intermittently and it leaks gas from around the fuel pump.
| Other Fuel System problems | |
| Other Fuel System Hoses Lines/piping, And Fittings problems | |
| Other Fuel System Pump problems |