Mower runs on fuel prime then shuts off

I have a Toro self propelled 22" mower. Used it last weekend and then shut it down. Went to use it yesterday and had an issue. It will start if I prime it, as I always do, but then it shuts off. I am guessing a fuel line problem but I don't have a repair manual that addresses troubleshooting. Any help, anyone? Tx

Being it starts and momentarily runs by priming, the usual recommendation for those symptoms is to remove the carburetor for a thorough cleaning.

I just went through a similar experience with a V twin briggs but the carb. was clean, the needle valve was stuck closed and the carburetor bowl was completely dry.