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Excessive gas tank pressure

Discussion in 'Wrangler TJ (1996-2006)' started by SJfamilyjeep, Jul 24, 2019.

  1. Jul 24, 2019 at 12:40 PM
    #1
    SJfamilyjeep

    #1
    SJfamilyjeep [OP] Member

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    On my 01 TJ I have a codes 0441 0442 0449 (faulty gas cap and faulty solenoid). When I take off the gas cap (factory) I there is a lot of air pressure escaping. I make sure to open it daily or else it builds up and I don't need a bomb in front of my house. I'm thinking a bad purge valve bad that's stuck closedAnyone else had this issue or had ideas?
     
    Last edited: Jul 24, 2019
    SJfamilyjeep, Jul 24, 2019
    #1
  2. Jul 24, 2019 at 1:42 PM
    #2
    Awrench

    #2
    Awrench Well-Known Member

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    2001 wrangler and I will guess a 4.0L engine.
    The codes will likely have a P in front of them - there are also prefixes B, C, U, etc and sounds anal but could.

    I am wondering if the sound is not pressure but VACUUM as air rushes into tank.

    P0441-EVAP PURGE FLOW MONITOR
    P0442-EVAP LEAK MONITOR MEDIUM
    this one below I need to check out.
    P0499-NVLD Canister Vent Valve Solenoid Circuit

    PS you are using a SCANNER to retrieve all codes? important.
     
    Last edited: Jul 24, 2019
    Awrench, Jul 24, 2019
    #2
  3. Jul 24, 2019 at 2:42 PM
    #3
    Jim Beam

    #3
    Jim Beam Well-Known Member

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    Fuel Injection, Dana 44s, T18, 4.10s w/lockers
    For starters I am not sure
    Is it possible that a bad gas cap could have set off those codes? It is of course the easiest thing to check.
     
    Jim Beam, Jul 24, 2019
    #3
  4. Jul 24, 2019 at 6:09 PM
    #4
    aggrex

    #4
    aggrex Well-Known Member

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    DE
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    Tuffy>AEV>TTO>JW>STech>EVOcage>MagnaFlow>SpiderTrax>RockHard>TF>SpringTail>67design>Bolt>GPCA>Curt>
    As mentioned inspect the gas cap and charcoal canister
     
    aggrex, Jul 24, 2019
    #4
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