I am about 18 hrs into phase 1, over all it went well. During today's flight, the high fuel pressure concern me. Engine is lycoming YIO-360, fuel pressure sensor came with the Dynon EMS sensor kit. In first few hour, the pressure range was betwwen 25-30 psi. At about 5 hours, the pressure can sometimes jump to 35psi, triggering alarm. Today, the pressure intermittently jumped to 45 psi (or maybe higher since the skyview was set to display 45psi max). Turning boost pump on didn't make much difference. The high pressure indication is intermittent, normally happened after reducing power to slow down or decend. When pressure is showing high, the reading is pretty jumpy. Sometimes opening throttle or pushing mixture to full rich will reduce the pressure a bit, but there is no definite correlation. Despite high and jumpy pressure indication, the engine continued to run smoothly. I searched the forum, and know that the other (old) sensor might have premature failure providing high and jumpy pressure reading, but I didn't see any such a report for the newer one that Dynon provides in EMS sensor kit. The search on this topic leave some action items to further check some other possible causes, but did anyone experienced the same thing on the Dynon fuel pressure sensor? I will call Dynon tomorrow to see if they can shed some light. Hope it is just the sensor, not the fuel pump.
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