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I have 2012 Chevy Impala LS 6 cylinder 3.6L. When I turn the AC/Heat on it smells like gas inside and outside. It also turns over for about 5 seconds before it starts. What is the problem?
 

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The 5 second delay could be causing this. Gas starts flowing when you turn the key.
 

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Do you get a check engine light? This sounds similar to people who had issues with their evap system. When starting it, press the gas pedal down all the way to the floor and see if it starts faster.
 

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The gas smell you're getting does sound just like the evap issues a lot of 8th gens tend to have.

In my case, I do get the gas smell in the car but it seems to only happen when I've been running the car for a while, like an hour or more. My car also throws P0442 code which I think is directly related to the smell I'm getting.
 
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