One problem related to fuel delivery has been reported for the 2000 Mercury Grand Marquis. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2000 Mercury Grand Marquis based on all problems reported for the 2000 Grand Marquis.
Fuel lines would rattle against underside of vehicle while driving. Clamps on fuel lines would loosen up after being tightened by mechanic.