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Car Forum / MINI / March 2006

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Vacuum in fuel tank/any advice ?

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Michael - 20 Mar 2006 23:07 GMT
When removing the filler cap I"m getting a rush of air into the tank.
Is this normal ?

Cooper sport 500.............
Chris - 20 Mar 2006 23:32 GMT
If it's a late twinpoint then the answer is yes.  It should have a non
vented cap - OE caps have green plastic on the underside, vented have red
plastic.  The fuel tank vents to air via a charcoal canister under the
passenger side wing.  It's another euro thing to reduce hydro/carbon
emissions to the atmosphere.  When the fuel cap on my wife's twinpoint got
screwdrivered in that fuel dispute I just refitted an OE vented cap.

Chris

> When removing the filler cap I"m getting a rush of air into the tank.
> Is this normal ?
>
> Cooper sport 500.............
Michael - 21 Mar 2006 21:54 GMT
Thanks Chris

Yes it is a late twinpoint (2001),does that mean it should have the cap with
the
green plastic on the underside ?
The one on it at the moment is the red one.

Michael.

> If it's a late twinpoint then the answer is yes.  It should have a non
> vented cap - OE caps have green plastic on the underside, vented have red
[quoted text clipped - 9 lines]
>>
>> Cooper sport 500.............
Chris - 21 Mar 2006 23:30 GMT
Michael,

Regarding the colours - it's the other way round to what i said!  Just dug a
new vented one out I have here.  It has 'vented' written on the green part
in 3 languages, I assume the red part may have 'unvented' written on it
somewhere?!

green is vented
red is unvented

Your car should originally have a red one - like you say you have.

Fitting a green one will do it no harm and it wont fail mot if you do fit
one.  I believe fuel caps must only be lockable.

Chris

> Thanks Chris
>
[quoted text clipped - 4 lines]
>
> Michael.
Michael - 22 Mar 2006 20:39 GMT
Thanks Chris.
My car runs fine,it just seems odd the amount of suction on my
filler cap when I remove it.

Michael

> Michael,
>
[quoted text clipped - 21 lines]
>>
>> Michael.

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