Quote:
Originally Posted by Iam Broke
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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Thanks for the info about the evap. I always keep the tank just about full, so I will let it run down to try and get the evap to ready.