My engine driven fuel pump pressure exhibits an anomaly during climb. Initial climb conditions are 135 kt IAS, WOT, mixture rich, Electric fuel boost pump on. Fuel pressure is 22 to 25 psi. At 1500 feet AGL fuel boost pump off, climb power set, 1000 feet a minute climb indicated. The fuel pressure will drop to 12 to 15 psi setting off the PFD alert. Engine runs smooth no RPM drop etc. boost pump back on fuel pressure returns to normal. Upon leveling off at altitude boost pump comes off, fuel pressure remains normal on engine driven pump alone.
Engine is a Lycoming I/O 390 with about 270 hours installed in an RV 8.
Engine is a Lycoming I/O 390 with about 270 hours installed in an RV 8.