[cheapeto]

I'm no mechanic, but I do wrench on mine as much as I can, as I have a full service manual.
On mine, there is a drain tube from the carb bowl with a tiny screw up inside of it, to drain the bowl. I think it's to release any water drops that may get past your filter.
The tube runs down to just below the motor, mine is in a sort of tube trap if you will.
If that falls out your carb runs of out of gas.
Good luck with your issue.