I will take the pump apart and see what I can find. I haven't tried flushing it yet - maybe that will help. Unfortunately, it would not suck up a single drop of fuel. The previous time it failed, it would still pump but would give an unreliable mixture causing the RPM's to change. I 've learned my lesson with this pump - never by an OS pumped engine unless you fly the snot out of it. I don't have much time to fly, so this is not the engine for me.