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For evap to pass on most GM's the tank needs to be between 1/4 & 3/4 with some warm engine idle time after a long cruise. Sometimes you can see it test the evap on a wb at a stoplight. You may hear a clunk in the trunk as the valve for the tank side opens & closes. HTH.
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Another 1 of 371 '12 T3 LS3 M6's built.
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