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Hissing fuel cap

Broken Byzan Jan 23, 2008

  1. Broken Byzan

    Broken Byzan Photographic Moderator Staff Member Moderator VCDS Map User quattro Audi A4

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    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
     
  2. madvw

    madvw Active Member

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    the fuel system is closed system, and the hissing from the cap maybe due to a worn out fuel cap.
     
  3. Broken Byzan

    Broken Byzan Photographic Moderator Staff Member Moderator VCDS Map User quattro Audi A4

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    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????
     
  4. madvw

    madvw Active Member

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    but isn't it hissing from the fuel cap? that suggests that it isn't sealing correctly.
     
  5. Broken Byzan

    Broken Byzan Photographic Moderator Staff Member Moderator VCDS Map User quattro Audi A4

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    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
     
  6. joost

    joost Active Member

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  7. Broken Byzan

    Broken Byzan Photographic Moderator Staff Member Moderator VCDS Map User quattro Audi A4

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    :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??
     
  8. filipharvey

    filipharvey Amusing Tagline

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    Had the same problem on mine, got a replacement from a Passat in a scrappy, different part number, but they are all the same.
     
  9. Broken Byzan

    Broken Byzan Photographic Moderator Staff Member Moderator VCDS Map User quattro Audi A4

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    Cap or N80 valve ??????????
     
  10. filipharvey

    filipharvey Amusing Tagline

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    Sorry, the valve! Clear as mud me!
     

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