Question about Audi A4

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Mums 1997 A4 has a banging noise under the rear right hand side which we think may be the runners for the petrol line? There is also pressure build up in the petrol tank which makes the car idle badly, however once released idling improves. Can anyone help us with what the banging may be and how it can be fixed?

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If this is a European car then the fuel system is a return to tank type,the vent is actually in the filler cap.try replacing same.
the banging could also be the exhaust hanger(rubber)missing or flexing onto the underbody.

Posted on Sep 03, 2010

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