1st replace the glow plug. A lot of times they just die if they sit there for long.

Then I would check the fuel clunk and replace the fuel line all the way up to the engine. Then remove the needle valve and clean it, but be sure to note where it was set so that you can go back to the right needle valve setting. You might wasnt to soak the engine and clean the fuel ports just to make sure nothing is plugged up.

Are you cranking with an electric starter? If not, you may want to do so until it runs a little.