Gasoline smell when running heater especially when sitting still. Smell seams to be coming through the vents. Also strong smell of gasoline out side of vehicle also. This does not happen all the time and is hard to determine what may cause it. It occurs sometimes when full tank of gas an sometimes when almost empty or even with other levels of fuel.

On a 2006 PT Cruiser, there is no direct means for gasoline to enter the crank case, so there should be no liquid gasoline there. Now, you will get a typical crankcase vapor smell (for lack of a better description), especially with higher mileage engines. These are hydrocarbons that have a distinctive smell.
Now; if you suspect gasoline in your crankcase, then take a quart sample of your oil and allow it to sit, sealed and undisturbed for several hours or all night. If there is gasoline, or water, then it will segregate accordingly.
Things to check:
When was the oil last changed?
When was the PCV (Positive Crankcase Ventilation) Valve last changed? If this is clogged, the result will be a strong hydrocarbon smell that will increase in intensity since it cannot vent properly. I would lean more in this direction.

Gasoline or exhaust fumes? If exhaust, you have a leak. If gasoline smell, tank may be over full and vent may be clogged.

Usually if you can smell fuel inside the cabin the vapors are coming in thru the vent system from the engine compartment.
Could be a fuel leak or a problem with the vapor canister.

If it is running fine, the busted bolt isn't the source of the gasoline smell. The intake manifold has vacuum, so the smell wouldn't be getting out, air would be going in, and a vacuum leak would give you poor idling. The exhaust manifold wouldn't have much raw gasoline smell. But it would have loud noise if the broken bolt were causing an exhaust leak.

Check that the vapor recovery line is not broken or disconnected. The hose connectors get cracked. If that were broken, it would cause a gasoline smell after the car has been sitting, especially if it has been sitting in the sun, heat driving gasoline vapor out of the tank. It is supposed to condense in the vapor canister, but some escapes if the line is broken. If it is broken, driving would **** out the gasoline from the line and the wind would dissipate the smell.

Or it could be a leaking injector. With the injector cover off, engine idling and cool, you can visually look for raw gas around the injectors and injector rail connections.

Hope this helps.

The charcoal filter is used to filter fumes from the fuel tank. There is a vent line, that comes from your fuel tank to this filter. (Charcoal canister)

Now since the charcoal filter has been completely soaked with gasoline, it will no longer function as it should. Even with vapors from the fuel tank vent line, the canister only has a working 'life' of so far.
You will smell gasoline in strong amounts until it is replaced.

Can't comment whether it is safe or not. (In my thinking, you are driving around with a charcoal canister, that has a charcoal filter soaked with gasoline. I wouldn't use it this way, but that is just my thoughts)

Don't know this car but from the age, I'd start looking for damaged fuel or vapor recovery hoses

A gasoline smell is from a leaking hose and you need to find that fast
You could have damaged a gas line during your repair work.
Get your money back on the damper repair. There are no gas dampers on autos.

you may have a small hole in the exhaust line somewhere (I had one just past the cat converter on my Honda). Have Meineke check it out for you (they'll look for free!)

:0)

I have seen a 2004 Grand Am that had a very light leak around one of the fuel injector o-ring seals allowing fuel to seep out onto the lower intake which then vaporize when the engine would get hot making the smell.

Have them check EGR tubes, and any hoses, or tubes running to the exhaust. My guess is ones leaking while driving & getting drawn up into the incoming air at the cowl.