Walbro carburetor on Vortex 100cc issue

Hello everyone,

as quite new to go karts, i got a bit stunned by my problem. I started my engine, with starter, my Vortex have clutch, and engine turned on, I leave it on the minimum for a while, like a minute or so and then hit a bit of throttle and notice that there is air in the tube, i just put new fuel tube from fuel tank to carburetor, then i lower the tube so all air did go to the carburetor and soon, fo course silly me, engine turn off!! Now I can't start it anymore..... Is there a way to leak air out of carburetor on go karts?? (Dumb questions, I know.)

My hands are pain for how long I did try to start it.
Also, how to empty air from the fuel hose in the future??

Thank you for your help.