Mercury Grand Marquis owners have reported 89 gasoline fuel system related problems since 1996. Table 1 shows the 11 most common gasoline fuel system problems. The number one most common problem is related to the vehicle's carburetor (44 problems). The second most common problem is related to the vehicle's tank assembly (11 problems). For details of each of the problem category, use the links in the table.
The intake manifold for 4. 6l engines are plastic and has been a problem since 1996 when they were recalled and Ford still used the plastic manifold anyway. My manifold cracked right behind the alternator spewing antifreeze all over the engine compartment. Read details...
When the gas gauge registers below 1/2 tank, and the tank is refueled to capacity, it takes several miles driving( approx. 30-50 miles) for the gauge to register full. Also, if the tank is towards the empty mark, and the car is filled to capacity, and he car is driven, the low fuel light will come Read details...
Fuel pump and crankshaft sensor both went out on vehicle at same time. Repair of crankshaft sensor was a $400 and fuel pump repair was $740. Doors do not lock properly when using the key remote and lights inside the vehicle on controls flicker on and off. Read details...
The contact stated while driving vehicle caught on fire. There were no warning signs indicating a problem with the vehicle. He noticed smoke coming from the floorboard and the dashboard. When he pulled off the road there were flames coming up through the floorboard. Read details...
The contact owns a 2004 Mercury Grand Marquis. The contact stated that while driving at approximately 30 mph, a fuel odor emitted from the vehicles vents. The failure recurred multiple times. The vehicle was not diagnosed or repaired. The manufacturer was notified of the failure. Read details...