Originally Posted by
Maxmill59
Both metered and unmetered FF are unstable in the same manner.
Okay, to verify. Per the diagram below when you ground ran the aircraft for the system check, both the unmetered fuel PSI/flow and the metered fuel PSI/flow had unstable (fluctuating) indications on the test gauges?
Was the indicated unmetered/metered fuel PSI within the required limits per the manual aside from the fluctuations?
And after you replaced the engine-driven fuel pump on the 13th, there was no change in the unmetered fuel PSI/flow?
When you checked the airframe fuel supply system, did you inspect the internal passages of the fuel lines/hoses from the electric fuel pump to the engine driven fuel pump?
Did you check the airframe fuel bladder venting system was properly working?
