Engine failures at full aft throttle? Lycoming 363i

[hawgdrvr]

I'm surprised at how many FX-3 owners I communicate with that are or have experienced engine failures with the throttle full aft (on the ground). The POH guides us to maintain 1000 RPM such as for ground ops but the one time we have the throttle full aft is coming in for landing. I learned from another FX-3 owner watching his YouTube videos where he does a full aft throttle pull after run up to ensure the engine will remain running with the throttle full aft as he's experienced this issue. I don't know if this is an idle mixture issue or an idle stop issue, such as RPM too low. The AMM says the 363i idle RPM should be 500-650 and recently in discussing with a friend affected by this Lycoming says 800-1000. I know of 1 or 2 that had an issue that the engine would quit after touchdown. Moral is this is more widespread than we think and I'd like to learn more about it and hear from anyone that's experienced this and why it's happening.

I bring this up to raise awareness to do a full aft throttle pull on the ground to make sure your engine will run in this condition, again where we find ourselves in this condition is only when on the final stages of landing. Do we need to raise the idle RPM?

In discussing this with an experienced cub owner he has concerns over vapor locks due to the fuel pump location directly behind the engine in the FX-3 and also suggests use of a cooling shroud on the engine drive fuel pump.

https://www.aircraftspruce.com/catal...clickkey=47037

I'm not about to second guess the engineering done by CubCrafters in cowl design and cooling or running any other scat tubes taking airflow from something else but is the fuel pump location, even though behind a heat shield, a concern? I did a search about this type of device as discussed quite a bit on the Van's forum as to whether or not it's needed and don't really have any conclusions. I defer to the experts.