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2003 Grand Cherokee i6 4.0L Large Evap Leak

Discussion in 'Grand Cherokee' started by SpartanRouge, Oct 11, 2017.

  1. Oct 11, 2017 at 7:35 AM
    #1
    SpartanRouge

    #1
    SpartanRouge [OP] Member

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    Oct 6, 2017
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    First Name:
    Aaron
    Vehicle:
    2003 Grand Cherokee Larado I6 4.0 2WD
    I have a code for a Large evap leak but i put a smoke tester on it and checked for leaks ever where besides above the tank because that's a lot of work to look for a leak. The purge solenoid works well. all the hoses and everything (besides one "vent" hose) on the left side of the rear bumper look good and are not leaking.

    Is there a COMMON evap leak on these trucks that isn't visible to the naked eye, If not what would be my next step? Should i take the tank down to look?

    Any thoughts or comments would be appreciated. Thanks
     
    SpartanRouge, Oct 11, 2017
    #1
  2. Oct 11, 2017 at 2:46 PM
    #2
    chris4x4

    #2
    chris4x4 With sufficient thrust, pigs fly just fine Moderator

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    Thea e are the most common issues:


    - gas cap left open or not closed properly
    - faulty gas cap or damaged gas cap seal
    - faulty or stuck-open vent control valve(could also be called vent valve or EVAP vent solenoid)
    - damaged or cracked charcoal canister
    - cracked or disconnected EVAP hose
    - stuck open purge valve (solenoid)
     
    chris4x4, Oct 11, 2017
    #2
    OFFGRID and JKBob 25 like this.
  3. Oct 11, 2017 at 7:14 PM
    #3
    Offroad798

    #3
    Offroad798 Well-Known Member

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    Bob
    Florida
    Vehicle:
    2015 Rubicon
    fenders, bumpers, winch, inner fenders, cb, headliner storage, oil pan armor
    As mentioned by chris4x4 theses are all culprits of leaks. Do you have a CEL light on? You should have a code for a big leak. A scanner should pull the code for you. Try one of the part store for a code check. This would get you in the ball park as what to look at. Also you have theses plastic lines ( rubber lines and conn) that connect all these items together. Barring no wrecks or damage. From my experience but no two vehicles were ever the same the gas cap, solenoids, hoses and plastic lines evap canister and gas tank fuel pump o ring . Good luck and let me know what you find.
     
    Offroad798, Oct 11, 2017
    #3
  4. Oct 11, 2017 at 7:25 PM
    #4
    JKBob 25

    #4
    JKBob 25 Well-Known Member

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    Jersey Shore, NJ
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    2016 JK Wrangler Sport
    Slightly off topic.
    I just noticed we have a new feature here. If your in the process of posting a reply, you will get a blue bar with a warning that so,excited one posted basically before you were done typing. I like it. This will help prevent you posting a reply that may....or ....may not. Make you look like a nit wit. Thank you. I for one like this new feature.

    So, back to the topic.
    As I was about to say. I've seen this issue with my old/ex XJ. And with a buddies f150. A gas cap issue. Not to take away from any other previous posts. Just my experiences.

    Yeah..let us know how you make out dude.
     
    JKBob 25, Oct 11, 2017
    #4
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