Scirocco Register

There's is one between the fuel tank and fuel pump and sits just above the rear axle, sometimes called an expansion tank, but it also contains a filter. It's also part of the return system and prevents fuel starvation at the pump under certain conditions.

Thanks. Will check it.

Checked filler neck.very rusty, have found one on eBay. Could someoneplease give a brief run down of how to do swap over?
Help appreciated. Thanks

ok Problem solved, it was the dreaded filler neck. Rusted through. have now replaced filler neck and cleaned out a completely shocking amount of rust debris from the tank. One piece the size of a 10p coin. Will try to upload photo.
Sailed through MOT last week with no faults or advisories, emissions test was perfect.
Thanks for all the advice given.

Good to hear it's fixed.