The smell comes from the front and HVAC vents. It is usually most noticeable after startup and at idle but can occur when driving as well. It is intermittent. Some days does it and others does not.

I have taken the intake manifold cover off and thoroughly looked at the injectors and rail and see no gasoline leaks. I think it is most likely a carbon canister related issue (PCV, CCV, hoses). Can someone confirm its location and attach a diagram for me to check it?

Thanks.