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Hissing fuel cap

Discussion in 'A4/S4 forum(B5 Chassis)' started by Broken Byzan, Jan 23, 2008.

  1. Broken Byzan
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    Broken Byzan Photographic Moderator Staff Member Moderator VCDS Map User

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    [Jan 23, 2008]
    I have noticed my fuel cap hissing lately, and have narrowed it down to the breather system.When the car switches over and stsrts pulsing the solenoid the car drops its revs and starts to run poorly for 30 secs or so then clears. I recon the charcol cannister is dodgy, so what i am saying is a) has anyone else had this as a problem and b) does anyone have one i can have etc etc

    Thanks
    Mark
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  3. madvw
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    madvw Active Member

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    [Jan 23, 2008]
    the fuel system is closed system, and the hissing from the cap maybe due to a worn out fuel cap.
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  4. Broken Byzan
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    Broken Byzan Photographic Moderator Staff Member Moderator VCDS Map User

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    [Jan 23, 2008]
    Yeah that and when the car activates the little solonoid on top of the airbox, the car idles funny for a short time then clears.So i was thinking it wasnt working properly when it swaps to the closed loop, hence a dodgy carbon thingy.

    Sound right????
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  5. madvw
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    madvw Active Member

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    [Jan 23, 2008]
    but isn't it hissing from the fuel cap? that suggests that it isn't sealing correctly.
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  6. Broken Byzan
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    Broken Byzan Photographic Moderator Staff Member Moderator VCDS Map User

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    [Jan 23, 2008]
    Yeah, but my thoughts are if its hissing there, it isnt breathing properly through the rest of the system ????? As the seal etc looks intact and i always click it yp when doing it up
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  7. joost
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    joost Active Member

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    [Jan 23, 2008]
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  8. Broken Byzan
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    Broken Byzan Photographic Moderator Staff Member Moderator VCDS Map User

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    [Jan 23, 2008]
    :icon_thumright:
    I shoulda known better and searched :asskicking:

    Interesting, although my solenoid seems to work etc ok

    I am willing to try it, anyone have a working spare??
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  9. filipharvey
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    filipharvey Amusing Tagline

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    [Jan 25, 2008]
    Had the same problem on mine, got a replacement from a Passat in a scrappy, different part number, but they are all the same.
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  10. Broken Byzan
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    Broken Byzan Photographic Moderator Staff Member Moderator VCDS Map User

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    [Jan 25, 2008]
    Cap or N80 valve ??????????
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  11. filipharvey
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    filipharvey Amusing Tagline

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    [Jan 26, 2008]
    Sorry, the valve! Clear as mud me!
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