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2007 Jeep Commander, 4.7. There is a fuel smell coming from under the hood when it's running and for a bit after it's shut off. It goes away after a few minutes. I've had my tech look at it several times. No fuel leaks at all. He said he believes that it's the vapor purge system. I have no clue how this is supposed to work. Anybody got any suggestions. Backstory, the engine has been changed, but this problem was present prior to replacement. Thanks