Can anyone shed light as to the correct routing of the vacuum hose on a uk spec 2000 model bird? every so often mine throws a wobbly in that she behaves as though there is an airlock in the tank preventing fuel flow. When I removed the tank for the winter strip and service i noticed that a vacuum pipe was not connected anywhere. Further investigation found a nipple on the left side beneath the injectors with a piece of pipe on as though the pipe had broken. I've looked along all of the pipe and one end appears to go to the tank, but what's confusing me is that there is a T piece in that goes below the engine like a drain? It makes no sense for a vacuum pipe to go to atmosphere or am I missing something obvious? Haynes manual is not very clear on this. Any help welcome. Thanks.