Smell gas inside - 1990 Lexus LS 400

A leaking fuel line can be discovered by looking for gaspuddles under your car when parked. A fuel-injection line may also leak, causing you to notice the smell of gasfumes during and immediately after driving. A fuel-tank vent hose may also leak, causing unburned gas to exit your fuel system as vapor.24 Apr 2015

The Reasons a Car Smells Like Gas When Driving and While Parked ...

www.livestrong.com/.../169275-the-reasons-a-car-smells-like-gas-when-driving-and-whi... https://www.google.co.uk/webhp?sourceid=chrome-instant&ion=1&espv=2&ie=UTF-8#q=Smell+gas+while+driving+inside+car

My 2004 Mazda 6 had a similar problem. It smelled like gas inside the car and had code # P0456. I found that the PCV line was pinched. The line was not an Original Equipment. I replaced the line and the PCV valve. So far so good...

On my 2004 Chrysler Pacifica I noticed a gas smell inside the cabin. I could also smell the gas very strong inside the engine bay when the car was running. It turned out to be a plastic line that connects between the fuel line from the tank, and the fuel rail which was leaking fuel. This line was located on the right side of the engine bay under the air cleaner. This was right next to the HVAC system, which was why I was smelling it in the cab of the car so much.

check garage for gas can first.

ask cadillac if they checked the charcoal canister

Check your muffler for holes. The gases can enter the passengers cabin and it can smell like gas, specially if your car isn't burning gasoline completely due to bad tuning.

A gas leak somewhere in the fuel system.

When the heater is turned on, it is drawing in air from the cowl at the bottom of the windshield outside the car. If your smelling gas when you turn it on, it would suggest to me that there may be a fuel leak under the hood. A lot of Honda's have the fuel filter under the hood against the firewall. Open the hood, and see if the gas smell is any stronger, or any gas smell at all for that matter. I would strongly recommend getting the car checked as soon as possible, if you can find the source of the smell yourself.

burnt or unburnt gas? if burnt gas smell look for bad manifold or manifold to pipe (donut) gasket.
if unburnt smell look for gas line leaks

I would definatly recheck the regulator to make certain you do not have any leaks.
But to be clear, you are smelling gas and not exhaust?
Also, is you cowl seal in good shape, not missing or damaged in any way?
Let me know.
Regards,

Remove the vacuum hose from the fuel pressure regulator have some one turn the key on but dont start the car if gas leaks out the regulator is bad.