max, i didnt fix it, i just took it apart
now as a sidenote... CHANGE THAT HOSE
get some 7-8mm ID hose... fuelhose will work wonders, you can get it from any motorfactors or halfords... oh and get a pair of new jubilee clips too...
its easy to change (in the light) but when you cut the new bit of hose... cut it about 1cm longer as itll fit on the metal pipe better