ORIGINAL: Thud_Driver

No easy way to tell. You didn't say whether there was white smoke out the back when the engine quit. If so, a positive indication of air in the line. There wouldn't necessarially be air in the line afterwards. With a 1.15 pump voltage at Low RPM cutoff, there should have been white smoke. If not, then there was some other interupton of fuel to the engine. The Low RPM off conditon says the ECU didn't do it. Numbers like those usually represent the condition at the time the ECU gave up trying to keep the engine running and shut down. The flameout itself would have been at a much higher rpm.

Possibilites:

1. Empty UAT - air leak in the fill line which caused no fuel to reach the engine - unlikely if the lines are air free

2. Low ECU battery - I've gotten airborne with batteries that started the engine but couldn't finish a flight - should get a Pwr Fail for that but I have seen some odd issues with marginal batteries.

3. Latent air bubble in filter which finally passed thru - I've seen flameouts for this as much as 6 flights after the lines were purged.

4. Air leak at the engine festo - I've seen 2 flamouts for this - solution is to trim off the fuel line and reinsert or change the festo.

5. Festos which leak air in the fuel feed lines - you'd think these wouldn't leak under pressure but problems seem to go away when you remove them.

6. Pump interuption or failing fuel solenoid

7. Internal engine issue such as bad fuel needles in the engine

What I've done when I can find nothing else wrong is to re-purge the fuel lines and go fly the airplane. Maybe even run it on the ground at high power.

Assuming you've not tried to start the engine since, you get get out the manual and use the GSU to look at what the pump & rpm did in the last few seconds before flameout.