The same thing happen to me twice on a Wren 44, after the first time I thought it might of been a battery and since batteries start dieing the ESU's do funny things so I replaced the battery. Then took it up for another flight same thing happen turbine shutdown and I landed safely. So I looked even further into the fuel system and found that the pump motor was dieing on me replace the pump and all is good now. Check you pump, use a 1.5V battery and see if it is pumping fuel at that voltage.