Started the serious high speed taxi tests today. Two faults - volts not behaving and fuel not behaving - pity, as you need those 2 for the engine to run properly.
Did 30 mins of high speed taxiing (5 x 40kts up the runway and 10 kts back along the taxiway). With WOT (wide open throttle) the fuel pressure drops form 1.4 to 0.6 so there is a restriction somewhere. The engine has both mechanical and electric fuel pumps so the pumping side should be fine.
I had previously bought some clear fuel filters as I don't like the opaque ones - can't see any rubbish inside. I changed the right side filter (as that is the tank I am running the tests with), then cut open the old fliter - no visible rubbish, so further exploration needed ...
