Audi A3 Fuel Tank Vent

Hi all,
I've seen some earlier threads talking about gurgling in the fuel tank and hissing from the filler cap and that sounds like the issue I'm having with my A3 - 1.8 T Sport
When I open the filler cap a hissing sound is emitted and a strong whiff of petrol vapour and gurgling from the tank itself. If I don't open the cap every so often, petrol starts to leak out of the cap (not gushing out).
Anyway, if it is the Fuel Tank Vent, as talked about in other threads, please can someone tell me where I can find this on the A3?
There's a small indent in the seal around the filler cap which looks like it might be a vent of some sort, but it doesn't appear to be blocked (I gently pushed a cotton bud into it and it came out a bit gunky but didn't jam up).
Any thoughts? - the thought of petrol leaking out is a bit of a worry.
Thanks All
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
On Jan 29, 3:03pm, brightwell snipped-for-privacy@yahoo.co.uk wrote:

A further point to note. For some reason the venting seems to be outbound - i.e petrol or petrol vapour trying to get out. Whereas I assume that the venting was for air to get in (to fill the gap left by the petrol as it is consumed). So maybe I'm on the wrong tack.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here. All logos and trade names are the property of their respective owners.