You need to lift up the rear seat base, and the petrol pump is located under it.
It looks from the top like a 5 inch circle of unpainted metal. The ring that holds it in can be gently tapped away (careful - you really do not want to make a spark!) in an anti-clockwise direction, as you would norally unscrew something.
The pump lifts up - careful with the float - if you knock it, it will give you inaccurate fuel level readings on your dashboard. Unplug the wires, and plug in the new one.
A fairly easy job, can be done easily under 15 mins including refitting.
Jonathan 'Boyrevel' White
February 2008
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