look under carpet behind rear seat acess panel to fuel pump check screws to pump and panel
The strong fuel smell could possibly be coming from the evap canister from inside the engine compartment. If the canister is not purging at the correct intervals than it will back up into the engine compartment and even possibly stall after awhile.
heater core going bad.
Very strong would not smoke inside no getting rid of smell
check the drain line on the a/c or does it have antifreeze smell to it then it could be the heater core
Well, one reason could be driving with the parking brake on. that fits the symptoms.
Your mother in laws chili.
Yes, speak to your doctor.
A smell inside is usually a bad evaporator coil.
The catalytic converter or a dead body in the trunk--you pick
It depends on how strong the smell is. Yes, it is harmful. It is a gas. And if can kill bugs it could be harmful for you. It could damage your lungs.
That depends on many factors. A strong smell could be picked up from a mile away, but a weak smell could only be picked up from a few feet. It largely depends on the strength of the odor.
I'm not a car expert but it could be something to do with your engine or you can check the inside the bonet is there is nothing ask you local mot place <><><><> Catalytic converter is failing- produces very strong sulfur smell. Get thee to an auto repair shop.