I had the best success with the pump out of the backplate to keep it from heatsoaking AFTER a flight. Stock Webra pump or P30 both worked well. I ended up running the P30 simply because it was lighter, and I think the diaphragms in my Webra pumps were damaged from heat (although I do know several different diaphragm materials were used along the way, so maybe the issue I had was solved at some point).

I've never seen what I thought was vapor lock on the 140RX (and that engine has more flights for more pilots in the NE than any other by far).

Regards,

Dave