The first thing is Dont run your motor on carb cleaner . You will burn out your pistons. If it works with carb cleaner then make sure that the pump ball is hard and not stuck squished . That would meen there is no air to keep the gass flowing .  Take off the hose from the motor and  then take a small metle wire and push the ball in where the gass comes out also make sure the air valve on the tank is open when you run your motor .You may have closed it the last time you filled up with gass. It will run until there is no air left then it will die. Make sure you dont get the gass all over you. If the air pushes the gass out then put it back on and then see if it will pump up until it gets hard again . If it gets hard then hook up your water ears so you have water cooling the motor and start the motor. if that does not work check the other gass line from the tank side and do the same. If that doesnt work try a new gass line . This sounds like a gass problem. there is something stoping the gass from getting into the carb with pressure behind it. You can also check the gass line at the motor itself as well .I am sure it will work. This is not a big problem. I hope you didnt run your motor on the carb cleaner for more than a second or two because that will do a lot of dammage to the pistins. Good luck Mike