Question about Hyundai Motor 2004 Sonata

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Car won't idle after I gas up

The last three times I've put gas in my car, when I turn it on to leave the station, the idle won't "catch." It fires right up, but then dies if I don't hold my foot on the gas pedal.

I can't imagine what tie-in it has with fueling up, because it doesn't do it any other time. When it does this, I have to pop the RPMs up to 3 or 4, hold it there for 5-10 seconds, then release, and the idle will catch down around 850. Doesn't die while driving (or at least it hasn't yet) and any other time I turn it on it starts just fine. It doesn't matter how much or how little fuel I have when I add more, it's happened both when I had a quarter of a tank left, and when the low fuel light was on.

It did this one about three or four months ago, but the next time I filled up it was fine. Now it's the last three times I've added fuel.

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  • small09 Feb 10, 2009

    mazda 626 00 car won't idle after i gas up!

  • travis861 May 11, 2010

    your information was helpful dom. but as i understand the filter in IN the tank. also, how to you check for the other stuff you mentioned?



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Hi there! sorry to say you got a sonata!! i was a master tech 4 hyundai! check your fuel pressure? replace fuel filter and check the release valve on the the fuel filler neck and the fuel tank breathers.

many thanks

Dominic Hill

Posted on Dec 11, 2008


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