I'm looking for suggestions to look for.
I have a 40FP on a Ringmaster, throttled for NW Sport 40 Carrier. It'll go like gangbusters for two or three laps, then suddenly die. It doesn't seem to matter what throttle setting it's at, from full to extra slow (but not hanging) flight. It doesn't seem to matter if I'm launching just a bit off full lean scream or quite rich.
The glow plug appears good, but I haven't tried replacing it (yet). The clunk is clunking. I can fly, restart without refueling, and it'll go for 2-3 laps then die just the same. The plane is landing with fuel in the feed tube, and at one point it quit in the ground with fuel in the feed tube.
When it cuts out it goes straight from full on to stopped -- no lean scream, no rich blubbering, no misfires; it just stops.
I'm mystified -- anyone have any suggestions?