I read Kathrynís Report for continuing safety education. An accident in 2015 in California involved a Czech built LSA with Rotax 912ULS engine. The NTSB said the cause of the accident was attributed to fuel vapor lock which has been discussed many times in this forum.
The airplane manufacturer didnít include a fuel return line with restrictor as Rotax installation requires. The airplane apparently flew successfully for 300TT and then developed vapor lock.
My takeaway on this accident is that this is analogous to shutting off the electric fuel pump in a RV-12. This topic has been discussed very thoroughly and can be searched for in this forum.
For what itís worth, Iíll restate my opinion that the RV-12 electric fuel pump should run all the time as designed by Vans Aircraft in order to mitigate vapor lock.
See alsoÖ http://www.kathrynsreport.com/2018/1...-accident.html