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Hi, My name is Jay
You should have the evaporative system smoke tested with the engine off as if you were at a gas station and see if smoke comes out of the fuel tank vent valve as it should. Also check to see if smoke gets into the intake from the purge valve leaking as it should not do this. If either of these are not working as it should then replace the vent valve or purge valve. The problem is caused with fumes filling the engine when you are refueling and flooding the engine.