There is the fuel block on the top of the 912 engine (for newer model). The rerun line has to come out from the top of the fuel block. So air in the fuel line can escape quickly to the tank through the return line.
we flew back to the airport and Martin was relaxed and he was excited speaking about smt with hands gesticulation... then I turn off the throttle: lost of power...
I got my Aveo Power Burst Strobes for about $400 at Aircraft Spruce
I'm very happy with them.
http://www.aircraftspruce.com/catalog/elpages/aveopowerburst.php?clickkey=74385