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Thread: Audi s4 2013 noise from underneath petrol tank after engine switched off

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  1. Audi s4 2013 noise from underneath petrol tank after engine switched off 
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    Can anyone identify what this noise is ?
    Happens after a run in the car . Engine off and Ignition off. High pitch pulsing sound from underneath petrol tank . Went on for ages . Eventually stops if I remove petrol cap . Air rushes out and can hear gurgling inside tank . May have to remove cap several times before it stops .

    Car also making a humming / drone type noise coming from rear of car when moving above 20 mph but possibly unrelated (wheel bearing/ drive shaft bearing?). Help on this also appreciated.
     
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  2. Re: Audi s4 2013 noise from underneath petrol tank after engine switched off 
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    Fuel tank breather blocked.

    Sent from my MI 6 using Tapatalk
    Audi A4 Avant 2.0 TDi 2009
     
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  3. Re: Audi s4 2013 noise from underneath petrol tank after engine switched off 
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    Thanks Shaka . Any idea where itís located and how to unblock it ? And what causes it to become blocked ?
     
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