Flying Sniffer
First of all you should bleed at 2 places, at the top nut on the fuel pump filter housing as per the manual and then at the fuel nozzle with throttle open and cranking.
Secondly I have had the same problem for 2 years on a 206, after replacing the FCU (A free loan item so no cost) and all other pipework and pump it was traced to the fuel line in the fuel tank, we changed the pipe, problem gone.
It was intermittent and always failed away from base, hopefully its just the pipe
REMEMBER TO BLEED AT THE CORRECT PLACE ON THE FUEL PUMP OR YOU COULD HAVE A BUBBLE OF AIR WAITING TO CAUSE YOU A PROBLEM WHEN YOU DEMAND HIGH FUEL FLOW..........
Good luck