Gasoline tap broken? Roller 50

Hello your motor-talk user, I have the following problem and that my scooter Spin 50 stopped at once. I checked everything and did not find it, OWNER when I wanted to clean my carburetor I naturally pulled off the petrol lines and from which came almost no droplets of gasoline, is the normal? Can my petrol tap be broken in this case because petrol lines and petrol filters are full of i.o.? How can I check the petrol tap if it has already been removed? Thanks in advance from Sincerely Venditor