Fuel not reaching my carbs

Hello
1998 600cc monster feul issues.
fuel not reaching the carb. have removed the pipe to the carb and blown down it and have heard bubbling noise from tank, can't suck fuel from it. so therfore for it is not a blocked pipe, (which i have replaced most of as this is a revamp job - 4 years in the prossess off)

so that is question 1

to make sure the engine was OK i feed the pipe to the carb with fuel with a makeshift pretend tank and bingo it sprang into life - happy days

But

when i kept filling my pretend tank i think once the float chambers where full it just dripped from what i imagineis an overflow - does this mean the floats aint floating?

So that is question 2

Question 3:

Are question 1 and 2 linked