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Just went through the Nissan Service Manual for the fuel system. It's actually not that complex. I would certainly say that you have a leak. Go through all the lines and the EVAP Canister and look for leaks.
When you run the tank down does the cap hiss when you remove it? If not, then you certainly have a leak somewhere and at a minimum fumes are getting out.
Just don't smoke around it until you have it fixed......
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