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The running out of fuel, when there is still fuel in the tank, is suggesting to me; that there is a crack or break in the pickup pipe, between the top of the fuel tank, & the bottom pick up point. Once the fuel gets down a bit, the break in the pipe, partway down, gets exposed, & sucks in air. I'm afraid, it's time for the tank to come out, for a complete inspection & clean. You cannot do any thing inside the tank, or even remove the pick up assembly; unless the tank is removed. While it is out, make sure you check the fuel sender unit. Cheers Banjo

So now you know the issue was your carby get yourself a carby kit and rebuild it then you will have the original on and that should make all your idle adjustments easier to perform. A kit costs about $80. You need a clean workspace and a couple of hours and it will be done. I rebuilt the carby on my daughters 4k with zero experience I learned as I went along. It was very satisfying when i reinstalled it on the engine and it fired up first go and idled perfectly. Its been going ever since. Cheers G