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UPDATE
After taking it to the dealership it was determined that the fuel pump has an internal leak letting the fuel seep back into the tank causing the issue. Fuel pump is going to be replaced next week, as far as being replaced under warranty GM says the fuel pump is not part of the powertrain so they won't fully cover it under warranty, but I have a very good dealership, they've agreed that I only have to pay $150 so I'm happy.
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