I started my p-60se for the first time today without a problem but noticed that it was not idling smoothly. This was due to air bubbles generating from the fuel pump feeding to the turbine. There were no visible air bubbles feeding into the fuel pump only out (a frothy fuel air mix no big air pockets). I increased the rpm and the turbine ran up smoothly without hesitation and stabilised well, the bubbles did'nt get worse @ the higher pump speed but were still evident, just didnt affect the the turbine like @ idle. The pump was mounted horizontally when this was happening, when I moved the pump to a vertical position (fuel lines to the top) the bubbles dissapear completely and the turbine ran smooth @ idle. I moved it back to horizontal thinking it was only air trapped in the pump which has been cleared but the problem came back.
Is this a case of a new pump just needing to run in a bit or could it be an internal air leak (no fuel was leaking out of the pump)?