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Leaking Fuel Cap

Discussion in 'A4/A4 cabriolet/S4 forum(B6 chassis)' started by Tim Woodman, Jan 11, 2013.

  1. Tim Woodman
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    Tim Woodman New Member

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    [Jan 11, 2013]
    Hi,

    can anybody diagnose this problem? My A4 is leaking small amounts of diesel from the fuel filler cap. I replaced the cap with a genuine Audi cap but it has not solved the problem. The inside of the cap is always wet when I remove it (my previous cars were always dry) and there is a visible wet patch beneath the cap on the plastic surround by the drain hole. When I have fueled up this often spills out on the back wing, even when the tank is only half full!?

    Is this something to do with venting of the fuel tank? I spoke to my normal Audi specialist (not dealer) who said he had never come accross it before.

    I have done some searches but I cant see anyone with the same problem.

    Any help appreciated.

    Tim
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  3. swarcup
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    swarcup Well-Known Member

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    [Jan 11, 2013]
    mine does the same although ive never thought it was a problem till now, do they all do it?
    #2
  4. Tim Woodman
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    Tim Woodman New Member

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    [Jan 11, 2013]
    Not sure but I've only noticed this on the last two fill ups. Can't be much fuel as it hasn't had any noticeable affect on mpg. Just don't fancy my hard earned diesel splatting down the back of my car.

    Do you notice it on the rear wing?
    #3
  5. Alihalimh
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    Alihalimh New Member

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    [Jun 8, 2013]
    I have the same problem on my A3. I noticed the fuel on the rear panel a couple of times then saw that the inner cap was sludged up. I cleared it out with a cocktail stick but it is still happening. When I wash the car water sits in the inside of the filler cap area and doesn't drain, which I don't think is correct.

    any ideas?
    #4

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