One problem related to fuel injection rail has been reported for the 2004 Jeep Grand Cherokee. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2004 Jeep Grand Cherokee based on all problems reported for the 2004 Grand Cherokee.
Fuel pressure dampener on the fuel rail leaked, dripping gasoline on manifold. This is a non-mechanical part. There should be no reason for a fuel leak to develop except for poor engineering/construction of the part. Leaking fuel in engine compartment is a safety issue.