Yep, sounds like that might be the problem. I had the 46 AX on my Tiger 2 cutting out last week. It wouldn't do it all of the time - plane flew fine 99% of the time. Rolled over to inverted and the engine died. My first deadstick - no damage - but I later found the fuel tubing inside had split and the klunk fell off.

So, I replaced the tubing and the next flight engine still cut out while inverted but only toward the end of the flight. The new line I had put in was too stiff and wouldn't allow the klunk to move freely. So, put in a more flexible line and going to try it out next flight.