Hamish,
Not all Zetecs had that carbon canister, so anyone who doesn't has this need 
not necessarily worry.

Regards,
Steve
--
www.h4-turbo.co.uk
www.quantumowners.co.uk
www.quantumcars.co.uk
www.quantumheritage.co.uk

On Monday 25 Apr 2011, Hamish wrote:
> A gas vent from the top of the tank connects via a solenoid operated
> valve  to the carbon canister where the HC  is scrubbed out and fed to
> back to the inlet manifold.  When the engine is switched on the valve is
> opened periodically when the ECU thinks it most appropriate so to
> do.  At other times if the tank gets warm then the petrol vapour builds
> up and increases the pressure in the tank by some small amount, probably
> less than 0.1 bar, so is of little consequence.  If your filler valve is
> maintaining this pressure then it is doing what it was designed to do,
> i.e hold a positive pressure in the tank but let in air if the tank
> pressure goes negative.
> 
> Hamish

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