Probably a bit late to ask as I've just fitted one!!!!! But I noticed that the screw in cap doesn't go right down into the filler neck like the oem one does, it just sits within the outer ring above the hole. It's just occurred to me that, from what I can tell there is nothing to stop the fuel sloshing up out of the filler neck and down the drain pipe (with a full enough tank and enough lean I'm imagining I could lose a fair amount!!) Any thoughts on this, am I miles off or is something to be concerned about?? Cheers Nick