there standpipe attached to bottom of the carb. going down into the fuel tank called the pick up tube also has last chance filter metal mesh screen at the bottom, clean it while you in there. It maybe cracked not sucking fuel from the bottom of the tank. you can also check out the diaphram while you have the carb. off the tank. If this is the type I think it all works off vacuum pressure and has diaphram that pulls fuel up to the carb. from the piston movment.You may find somthing.

That is the type of carb on this machine and I will take it apart again and also replace that tube.

Thanks for the help.