hi i am having the exact same problem, when i try and prime more fuel through, there seems to be a blockage somewhere, I have checked the pipes to and from the petol tank they are all clear, After trying to blow some air through the carb, this still has not cleared it.
I know it is a walbro but have not idea what model it is? where do you get these details. My grass is so long the neighbours will be complaining. Thanks to K3 for advice I will give that a go.
Barney Fitzpatrick/ Ire