Hi Andrew,
There is a breather pipe on top of the petrol tank which (on my 410) is copper and runs towards and underneath the 2” filler pipe; this copper pipe turns up behind inner roof lining in the area between the rear windscreen and the rear near side quarter light, before doubling back down and connecting to a rubber hose. The rubber hose enters the boot and runs along side a second hose which come from the filler recess. Both of these hoses are located on the boot side of the rear near side wheel arch; they are hidden behind an aluminium panel. To access the panel and the hoses, the carpet will have to be pulled back. Both hoses terminate on the underside of the floor pan, again to the rear of the wheel arch.
Also check the rubber diaphragm on the filler cap.
Hope this helps.
Brian
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