Kia Troubleshooting Questions? Ask a Mechanic
The most common cause for this issue is a sticking purge control solenoid. This is likely what caused the check engine light to come on.
When it's working normally, the purge solenoid will come on or open when you are driving the car. This will suck the fuel vapors from the charcoal canister into the engine. This is normal. When it sticks open, when you fill the tank or add fuel, the vapors go into the intake and essentially flood the engine. This will cause hard starting after you fill the tank and also rough running until the extra fuel vapors are cleared.
Typically you have to replace the purge solenoid to resolve the issue.
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