Because I'm an advocate of trying the easy fixes first, I would just check your clunk. You say you had a good landing, but they also say, "any landing you can walk away from is a good landing". I guess that would translate, in our RC world to, "any landing where you don't have to repair your plane is a good landing" I'm just trying to say that even a slightly rough landing might have thrown your clunk ahead, and pinched off your fuel draw. It's a lot easier to check than hauling out your tank first, only to find, all you had to do was shake your clunk back into position.

Lm