One problem related to tank filler pipe and cap has been reported for the 2004 Nissan Sentra. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2004 Nissan Sentra based on all problems reported for the 2004 Sentra.
Refueling: this 2004 Nissan Sentra 1. 8s has had issues when refueling. The tank is not properly vented thus leading to a rush of pressure once the fuel cap is opened. This results in gasoline rushing up through the filler neck and spilling out. In addition, the tank is hard to fill as station nozzles do not permit refueling if the tank is not venting correctly while fueling; the station pump automatically stops fueling. This is a hazard as raw gasoline and outside environments do not relate. A simple google search on "04 Sentra fuel tank" will return hundreds if not thousands of owners with the 2004's who complain about the same exact issue regarding the venting of the tank. The 2005 models were recalled but Nissan left the 2004 owners aside; they know the 2004's have the same issue as the 2005's that were recalled.