my fuel tank pipe ,the pipe that runs from where you top up at filling stations to the tank was rusty and had holes in spilling out fuel,Now about to put replacment pipe on, i noticed it had different fule cap as this was of a non turbo, and the cap has no holes in and tightens right up, where as my origanal cap makes a clicking noise sujesting its not pressureised . would this be true , oh yes and my car is a UK TT. MANY THANKS :)

TT cap should have no holes in either and should tighten up and click when fully tight. I dont believe there is a difference in tanks...I'd go check the difference between Caps now but its pi55ing it down ouside.