I sure hope someone finds the answer to the "Rattling Sound" as that is exactly what it sounds like in our 98 Mystique 2.5L Duratec 5 Speed. Someone earlier on a similar thread mentioned that they thought it coukd be a loose or bent gas tank sensing float that is banging against the tank. My tank was replaced under warranty for the trick gas guage stunt ( a new tank) but they reinstalled the old pump and its integral fuel sending unit.
Regards,
John
