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I have a 2011 sonata 2.0t. When I go to the gas pump I have to put the nozzle upside down or it will keep clicking off. Anyone have any idea how to fix this or what causes it? Thank you

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Your vehicle has an emissions system to keep hydrocarbons from escaping and polluting the atmosphere.
As gasoline enters the gas tank, air must leave to make room for the gasoline.
This air goes through the hoses through the charcoal canister and then through the vent valve.
If the vent valve (normally open) is stuck closed then no air can escape and will cause the fill hose to stop.
If the charcoal canister is clogged (can be done by overfilling at pump) then fill hose will stop filling.
 
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