Tom, I finally figured out the high speed miss on the Cummins. It was water in the filter jar. This little exercise has taught me a few humbling lessons. First, my schedule to dump fuel from the filter needs to be shorter than every 6 refuelings. I understand this is dependent on the environment, but there was no water in the bowl alert, which should have occurred. I borrowed a DRB3 and ran all the tests in order to familarise myself with them and a few tests created strange results. If you would, could you please verify or interpret these readings.
Fuel water sensor voltage = 5.2 V (water in the bowl,. no error) Boost pressure at Idle (750 rpm) = 100kpa (0 PSI on gauge) Boost Pressure, Ignition on, engine stopped = 99 kpa (0 PSI on gauge) Boost Pressure, WOT, max speed, 3200 rpm, (30 lbs on guage) = 260 kpa, (max EGT 1100 F)
Thanks in advance, Steve