Swishing sound under bonnet..

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Exactly like this:

Audi s4 swishing noise - YouTube

has happened everytime the next day after filling up. evap related??
sounds like pressure being let off... about 5 soconds of it.

audi a3 8p2 2.0T dsg

any ideas appreciated.

 

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boomp

im selling this car to my work colleague but i want to make sure its in good working order before i do... any advice much appreciated

the sound is now also at the back of the car near the fuel tank...

it sounds like excess fuel pressure almost... do you think the charcoal cannister has had it? I didnt realise over filling was a no-no on our cars until I got the N80 fault code.. that helped sort a lot of probs... this only tends to happen on hot days though... iirc read something about parking in the sun and vapour lock in the fuel lines due to heat.