One problem related to fuel injection rail has been reported for the 1999 Infiniti I30. The most recently reported issues are listed below.
While at a stop, gas fumes collected and seeped into the passenger cabin. The dealer replaced the fuel valve and evaporator canister, but the problem still recurred. Check engine light came on and the gas pump kept shutting off when filling even though tank was not full. Smell possibly came from fuel injectors on rear bank.