If memory serves me correct which I hope its working, if your low on fuel and its hot the tank/s will pressurize and push on the gas cap causing the light to come on. Someone mentioned to me the fuel keeps the pumps cool which when creating less heat, less pressure.
I dont see why the dealer charged you 70 bucks, my mom had the same problem on her 04 Impala couple months ago, with no extended warranty, they replaced it for free.
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Beware the snake bite.....
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