There is a gas leak.
A fuel leak can be a very dangerous situation. Your car needs to be inspected and fixed as soon as possible. Fuel leaks can come from a cracked fuel tank or damage on any of the lines that run the length of the vehicle from the tank, up to the fuel rail. These lines can rust from inclement weather. Another possibility can be failing injector o-rings leaking fuel. An inspection of your gas tank should be carried out by a technician in order get your leakage fixed.
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