It's a matter of observation. Nobody here can see where the fuel is spilling out.
Recently the fuel lines (3 of them) on my little tiller perished - air was being sucked into the carb instead of petrol.
Tip your machine on its side and see what happens - then tip it on the other side.
Look carefully to the fuel lines and any priming bulb - they're easy to replace.
Good Luck..., October 2015
