Honda mower engine won't start

I have a craftsman push mower with a 5.5 Honda engine and it wouldn't start so I put on a brand new carb and dumped the gas and put on new fuel lines. Still won't start but it will run a few seconds if I spray start fluid in carb. Its like the gas isn't getting into the engine? Any ideas? I put on a new plug and loosened the carb bowl screw and it has gas so I'm at a loss.