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Hi--this is my fisrt contribution to a tech thread and don't own an NSX yet, although I'm actively looking. Anyway--the fact that there is a gradual diminishing of the odor day by day may mean a gradual improvement as the fuel level drops with each drive. If this is the case, you may have a small leak at a fitting located higher up in the fuel system--such as the filler hose or hoses involved in the gas fume recirculation system. If you haven't filled up the tank since this started, do so and see if the odor returns. Just a thought. Good luck and fill us in on what happens.