No Im not using a pump. Not yet anyway. [8D]
I also tried richening up the mix until the needle came out, that didnt work.
Im going to doublecheck the clunk and make sure it isnt doubled over in the tank. Im also going to pull the cowling and tank and check the pressure line for a crack or a hole, that would do it.

I dont understand, it ran well last week other than expected problems during a waterfall without a pump, now it wont run reliably in flight... I dunno what would change setting up for a week??