Poulan Push Mower Engine Keeps Dying?

I have a Poulan Pro Push Mower. I tried to get it to start, it started first pull all summer, but now when I choke it (push the little bulb), it fires immediately, but as soon as the little bit of fuel from choking is gone, the engine stops. It will start every time I repeat this process, but it won't stay running. Any suggestions will be appreciated.

By Dick D.