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Thread: When is a Gas Cap issue not a gas cap issue?

  1. When is a Gas Cap issue not a gas cap issue?

    In the last few weeks, I've been getting more than a few Small Evap Leak codes (P0442), and the 'Check Gas Cap' light has come on more than a few times. The gas cap's looked pretty ratty, so I replaced the cap yesterday. I'm still getting the gas cap light and the leak code. I've reseated the new cap, but it doesn't seem to make a difference.

    Today, I noticed that the new cap already has a gas smell, and looks damp around the seal, as does the filler area. I last filled the tank several days ago and I'm now at 3/4 full. Is that indicative of a bigger problem?

    What should I be looking at, here?

  2. #2
    Join Date
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    could be a bad evap purge valve or a vacuum leak in those lines. not sure what else would trigger a P0442.
    peter

    2018 Subaru BRZ RS 6MT

    2015 VW Golf TSI Comfortline 5MT

  3. #3
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    Shawn had an issue with a corroded hose near the charcoal container. Not sure if that was throwing any codes at the time for him.

  4. #4
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    When is a Gas Cap issue not a gas cap issue?

    Yep. Also had p0456. And here was the culprit. Pull the wheel well trim by the gas filler tube. Ifirst replaced the two evap pumps (engine and charcoal can) to no avail.








  5. #5
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    oh right! that little F bomb... forgot about that one.
    peter

    2018 Subaru BRZ RS 6MT

    2015 VW Golf TSI Comfortline 5MT

  6. #6
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    Car got a P0442. Will replace the gas cap first and then investigate in this area. thanks for the pics Shawn.
    325i, 2005, 5MT, Silvergrey, leatherette, Sport package; CDV delete, KONI STR-T & KYB Excel-G, Weisslichts, Stewart H2O pump

    328i, 2010, 6MT, Spacegrey, dakota leather, M-sport packages; all stock
    http://s900.photobucket.com/user/othibau/media/Junesig.jpg.html][IMG]http://i900.photobucket.com/albums/ac208/othibau/Junesig.jpg

  7. #7
    Join Date
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    Quote Originally Posted by Oli77 View Post
    Car got a P0442. Will replace the gas cap first and then investigate in this area. thanks for the pics Shawn.
    I don't have a code, but went ahead and bought this as a preventative since my cap gasket is pretty well cracked

    RKX Replacement Gas Cap Fuel Seal... https://www.amazon.com/dp/B07BNX8MT9...p_mob_ap_share

  8. #8
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    Duuh, could have bought just the seal!

    Sent from my SM-G935P using Tapatalk
    325i, 2005, 5MT, Silvergrey, leatherette, Sport package; CDV delete, KONI STR-T & KYB Excel-G, Weisslichts, Stewart H2O pump

    328i, 2010, 6MT, Spacegrey, dakota leather, M-sport packages; all stock
    http://s900.photobucket.com/user/othibau/media/Junesig.jpg.html][IMG]http://i900.photobucket.com/albums/ac208/othibau/Junesig.jpg

  9. #9
    Join Date
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    Lexington, KY
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    New gas cap, cleared the code and on we go.

    Sent from my SM-G935P using Tapatalk
    325i, 2005, 5MT, Silvergrey, leatherette, Sport package; CDV delete, KONI STR-T & KYB Excel-G, Weisslichts, Stewart H2O pump

    328i, 2010, 6MT, Spacegrey, dakota leather, M-sport packages; all stock
    http://s900.photobucket.com/user/othibau/media/Junesig.jpg.html][IMG]http://i900.photobucket.com/albums/ac208/othibau/Junesig.jpg

  10. #10
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    Autozone.com
    Good

    Sent from my SM-G955U using Tapatalk
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