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what is it?

Discussion in 'Diesel forum' started by vw754, Mar 22, 2007.

  1. vw754
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    vw754 vorsprung Durch Technik

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    [Mar 22, 2007]
    what the small button inside filler neck,and whats it for?
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  3. inigoj
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    inigoj Member

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    [Mar 22, 2007]
    I think it closes one of the vents in the filler neck while the fuel cap is off, so that it does not fill/overfill with fuel whilst filling up.
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