Gas engines usually don't smoke unless there is way too much oil in the fuel..
If a Walbro carb won't draw fuel the usual problem is stiff diaphragms or an air leak under the carb that keeps the crankcase pulse from reaching the pump side of the carb..
A diaphragm kit is only about $5.00 from a chainsaw dealer or sometimes a rental yard that rents out saws and weedeaters..The 3.2 engines usually use a Walbro WT76 carb..