Cadillac Repair Questions? Ask a Mechanic for Answers ASAP
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This most likely means the purge solenoid is stuck open. The purge solenoid allows fuel vapor back into engine to help reduce emissions, if it is stuck open it will allow too much fuel vapor into engine causing it to run rough after filling tank. This i about a $300 job to have done at a shop depending on where you go. Let me know if you have questions, thanks.