I have a Briggs and Stratton 31m777 have rebuilt the carb, adjusted valves, It starts with choke but won't stay running. I can dump fuel into the carb and it will run.

Let it run with the choke for a while. There may be buildup in the cylinders that needs to be burnt out. In order to do that you need to let it get hot. Try very slowly opening the choke after its been running a while. Listen to the engine and if it sounds like its about to die, close the choke. You may also need to use starter fluid, it burns very hot and clean. You can pick it up at your local auto parts store. You may need to spray it into the carb the first few times to get it started.