The fuel from my 49cc petrol scooter isn't getting through the carby. ?

Question

The fuel is going into the carby and then coming out through the air hose, and going back into the petrol tank. HELP!?

Answer 1

For future reference, always give year, make, engine size and model # when asking questions. We need all of that info to give an informed answer.

4 stroke - leaking intake valve. The compression of the engine would blow the fuel out of the intake valve, back through the carby into the air box.

2 stroke - non sealing reed valves. Same thing, but when the fuel is on the transfer cycle.

Both type engines - low compression wouldn't create enough vacuum to suck the fuel into the cylinder.