I know this is going to end up being something simple lol. It always is in these situations. But without looking at it, I'm all out of ideas. check to make sure your carb is secured tight and there is no air leaking around it. Make sure there are no holes in your fuel lines, make sure the head to block gasket is good. Make sure the back plate gasket is good. We know your glow plug is good and that it's getting fuel, so I'm not sure what else would cause it to not run.