Materials to Maintain Your ZHP IIIII Hand Protection IIIII Tools to Maintain Your ZHP
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  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
    Feb 2014
    Location
    Kitchener, ON
    Posts
    6,034
    could be a bad evap purge valve or a vacuum leak in those lines. not sure what else would trigger a P0442.
    peter

    2004 330i ZHP
    2005 330iT ZHP
    2010 328iT M Sport

  3. #3
    Join Date
    Nov 2014
    Location
    Portland, OR
    Posts
    10,243
    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
    Join Date
    Jun 2011
    Location
    VA/DC
    Posts
    14,445

    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
    Join Date
    Feb 2014
    Location
    Kitchener, ON
    Posts
    6,034
    oh right! that little F bomb... forgot about that one.
    peter

    2004 330i ZHP
    2005 330iT ZHP
    2010 328iT M Sport

  6. #6
    Join Date
    Jan 1970
    Location
    Lexington, KY
    Posts
    4,903
    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; has a 330 intake but no tune - yet
    http://s900.photobucket.com/user/othibau/media/Junesig.jpg.html][IMG]http://i900.photobucket.com/albums/ac208/othibau/Junesig.jpg

  7. #7
    Join Date
    Nov 2016
    Location
    Charlotte, NC
    Posts
    3,130
    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
    Join Date
    Jan 1970
    Location
    Lexington, KY
    Posts
    4,903
    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; has a 330 intake but no tune - yet
    http://s900.photobucket.com/user/othibau/media/Junesig.jpg.html][IMG]http://i900.photobucket.com/albums/ac208/othibau/Junesig.jpg

  9. #9
    Join Date
    Jan 1970
    Location
    Lexington, KY
    Posts
    4,903
    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; has a 330 intake but no tune - yet
    http://s900.photobucket.com/user/othibau/media/Junesig.jpg.html][IMG]http://i900.photobucket.com/albums/ac208/othibau/Junesig.jpg

  10. #10
    Join Date
    Jan 1970
    Location
    Southern California
    Posts
    18,064
    Autozone.com
    Good

    Sent from my SM-G955U using Tapatalk
    Randeaux/Rando/John/jr - '06 Cic ZHP; Southern California
    "ZHP or not, I still like you"


    ZHP Performance Package, Cold Weather Package, Leather, Jet Black/Black/BlackCube, NAV, Anthracite Black "my individual" interior trim
    ESS Stage 1 Twin Screw Supercharger, Sprint Booster, BMW Perf Intake, Magnaflow Exhaust, Dinan TB & STEP S/W, UCC Sway Bars, Apex EC-7 18x8.5 ET38
    Suspension: AST 44100 dampers, Bimmerworld front adjustable end links, Swift springs (8K front, 10K rear), Vorshlag camber plates
    Dynavin D99+, Hardwire V1 (w/V1 Connection), BSW Stage 1 Speakers, Kicker Amp/Subwoofer
    BMW Performance Strut Brace, Orion V2 Angel Eyes, No-holes License Plate, SMG Paddle Shift Mod, Besian VANOS, Gold DISA, Fan Delete, M3 Side Mirrors
    Note: Actual car no longer resembles signature picture

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