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P0442 on 2004 Tundra

Discussion in '1st Gen Tundras (2000-2006)' started by stevieboycapecod, Aug 20, 2016.

  1. Aug 20, 2016 at 3:38 PM

    stevieboycapecod [OP] New Member

    Aug 20, 2016
    This is a small leak in the evap system. I replaced the gas cap and filler neck a little over a year ago and the code cleared but came back on a few months later. This is not my primary vehicle but I need to get this fixed for a state inspection. Truck has about 230K miles.

    I tested purge valve under hood and it appears to pass a vacuum. There is a small loss of vacuum but I attribute that to my ability to make a good seal. Maybe I'm wrong.

    There is another valve near the charcoal canister which I took off and stimulated with current and it appears to operate.

    I built the YouTube smoker and smoked the system. I observed smoke pouring out of the fuel port. I replaced the gas cap with an after market cap from Auto Zone. and smoked again.

    There is smoke coming out but it appears to be on the inside of the filler neck assembly around the plastic collar. I took the filler neck off. There are three tubes: Main gasoline tube, small 1/8" opening tube, and a 1/2" tube. When I blow in the gas tube and seal the 1/8" tube, no air comes through. When I blow in the 1/2" tube air escapes around the plastic cowell. Is this by design? Is that a breather tube. Is this why I have smoke coming through? Should I have key on/engine off when I smoke? Would that close a valve that would prevent smoke from going to this tube?

    Or, should it not be allowing air to pass and it's just broken.

    New to forum. Sorry for the first post being so lengthily.
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