ZTR50 Wont Stay Running

I've used the mower 3 times this year. I went out to start it and it wouldn't start. Tried starting fluid and it ran 5 seconds so I figure a fuel delivery problem. Checked the fuel pump and it works. Took the bowl off and it's got gas in it. The two "metering tubes" were not clogged so I tried again. Doesn't start. Where do I go from here?
Kawasaki 22 HP FH661V