912ULS Engine Failure after TO

I not convinced that it was vapor lock without further investigation. The OAT was only 73F. In the SW US like where I live in Arizona we use 10% ethanol with temps at 105F without issues. 23c (73F) is quite cool. Everyone always wants to blame vapor lock without a good investigation. Plus they said the previous 8 hrs. With similar conditions wasn’t an issue. Nothing posted on oil or coolant temps, EGT at hat time or fuel pressure at the time. Has a compression test been performed since the incident? There are other things to also rule out before just saying it was vapor lock. You need more info to make a good solid logical conclusion.

FYI

https://www.atsb.gov.au/media/47763/carb_icing.pdf

If we’re thinking carb ice then what type of air intake do you have? K&N’s on each carb or a single air filter that gets air from outside the cowl or an open air engine?  Do you have a carb heat device setup. If you have individual K&N’s on each carb inside a cowl it isn’t carb ice.

Like I said we need a whole lot more detailed info for a solid diagnosis.

I have seen water separate out of 10% ethanol fuel overnight.  Comes down to how much alky was really in it and can it stand any additional condensation combined with a cooler overnight temperature. Also was there any water in the system before fueling.  It's not always obvious whether you've sampled clear unleaded fuel or water but one drop of food coloring in the sample sure makes it obvious if there is any doubt.

Sean Griffin wrote:

FYI

https://www.atsb.gov.au/media/47763/carb_icing.pdf

Note that, for his temperature/dewpoint, this chart shows a possibility of moderate icing at cruise, to serious icing at descent power, but not at take-off power.

As Roger says, more information on the type and placement of the air intakes could rule it out almost entirely.