Update, after a process of elimination ,aux pump completely off, throttle closed and full choke she starts great the last few flights!, I believe the issue was like the hot gas can in your garage ( bulging) from the heat, the fuel was not evaporating and there was not a lack of it! it was expanding in the system and adding any pressure or more fuel aggravated the problem and flooded the engine hence the hard long rough starting , and there was no need for priming/boosting/pressurizing the system on the stingsport! when it was colder and in the winter the norm was to use aux pump and always worked like a charm when it was cold,This is my first summer with the stingsport/ rotax912uls, and yesterday it was 104 in St. Louis , all that said, thru trial and error and advise from the forum. This solved the problem! I guess the installationsi of the rotax 912uls on different planes and system setups starting/operations vary a bit. Fly fun fly safe!
