Strange B206 start issue
Hi, first post so be gentle.
My 206 BIII has a strange start problem that has my engineers flumoxed. If it's left for any amount of time (24 hours, sometime less), the fuel drains back through the pipework and it just doesn't start - oh and the problem is intermittent, sometimes it starts fine! When the start fails, the system needs to be bled, usually back to the pipe that leads into the FCU. Once this is done, it's fine. It starts normally and runs sweet as a nut.
So far they have changed the in-line non-return valve, had my PT governor overhauled, tried another engine driven fuel pump, non return valves on the two electric fuel pumps.Closing the fuel valve after shutdown has no effect. None of this has made any discernible difference to the start.
Anyone come across anything similar? This problem has been ongoing for a few months now.