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MG MGF Technical - Is this normal

Hi

I've bought a new MG TF and I love it :-) One thing I have noticed though is that when I undo the petrol cap to fill up, there is a suction noise like air runshing in!

Is this normal? I've never heard it on any other cars I have driven?

Thanks for any help
Neal
Neal

The same thing happens on my 98 F, so I would say it is normal. Sounds quite cool I think.
Neil Stothert

Hi Neal,
Don't worry, this usually happens when the fuel level is low in the tank.
As far as I remember ,the fuel tank/fuel system isn't vented to atmosphere.
So as the fuel level drops in the tank ,a partial vacuum is produced in the tank, which, when the fuel cap is removed, sucks in air from the outside.
Causing the noise you've described.
Has happened on most cars that I've driven.
All the best,
Mike
M Atkinson

Agreed. 100% normal. :)
Paul Nothard

a bit like a f*rt going backwards

(I'll try and be a nice boy from now on)
Gary

Yes, normal - it's a product of the pressurised fuel system used in modern fuel injected cars.

Tim.
Tim Jenner

This thread was discussed on 20/06/2004

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