Depending on where your vent line is left open to atmosphere, your car can you stink to high heavens if it is in the engine bay or front fender well.
Anyone who says otherwise is speaking from speculation. It gets worse with the windows down and at idle.
If you know where the line is open, you can cap it for a “short” drive and see if the smell improves. This will also give an indication if your has system is sealed...not a 100% accurate. After said short drive one of 3 things could happen.
1. Smell reduces and you go to your gas cap, (open away from any ignition source i.e cigarettes/open flame) and you should hear the pressure release if everything else is sealed. Sounds like an air brake discharging. Get a charcoal canister and purge solenoid.
2. The smell is not as strong or takes longer as it either finds the weak point in the system i.e rubber seal mentioned above or somewhere else. Sometimes if the vent pressure gets too high it can blow the cap (the cap you put on the line temporarily) off or the line off behind the passenger side door. An indication of this will be no releasing built pressure at tank.
3. Capping it does nothing at all. Meaning the vent pressure (gas smell) is not even making it to line. Inspect gas system.
If your car is making your clothes stink when you have the windows up. Check the rubber gourmets in the engine bay and ensure the rubber seal is below the leather boot of shifter. A lot of people forget to put this in after a swap or changing shifters.
Lastly if it is running rich as you mentioned...before we had wide bands and standalones....we just read the plugs. Pull a plug (or a few) and sell how its burning.
If it is pig rich, then i would check the MAF and ensure it is indeed calibrated for your injectors.
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