ah - another one lol - try swapping over the 6mm rubber hoses. one is a vacuum pipe from the rear cylinder inlet, the other is a breather.
i suspect you have put the breather on the vacum stub on the fuel tap,.
it should pull a diaphragm and allow the fuel to flow.
dont worry, everyone's done it! label them next time!
get yourself a free copy of the workshop manual from the link in the workshop knowledgebase section
