Big difference between gas smell and EXHAUST smell . It seems you are referring to exhaust . Many ways for it to get in the cabin if car is not properly sealed . Start searching exhaust fumes on this site and others.

Biggest culprits

tail light seals

hatch seals

inner hatch panel seal

8 hours ago, zdude1967 said:

Does your Z have the carbon canister system hooked up

Yes I do but again, I think you are smelling exhaust instead of fuel. If you're running a little rich, it's probably mixed in your exhaust and you might smell that as well. You can get a smoke machine and look for cabin leaks and I bet you'll find them in the areas noted above.

Thanks- the car is set for paint. The rubber will be replaced directly after so I may have to deal with the smell until late spring 2018.