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  #31  
Old 09-14-2018, 08:21 AM
mr.sun mr.sun is offline
 
Join Date: Aug 2006
Location: Wet, Western Washington
Posts: 127
Default High Fuel Pressure

I have about 1000 hours on my -7 behind an IO-360 and have been seeing intermittent high Fuel pressure as indicated by the SkyView. Yesterday's flight showed about 38 psi on run-up and after 30 minutes dropped back to the high end of the green. Pressure drops momentarily when I apply throttle and always drops after flying a while. After a fuel or lunch stop, while still warm, pressure still normal. Seems like the first run-up and take off for the day, I see high pressure. I have replaced the mech fuel pump and the VDO sensor (twice). I think I still have a bad sensor. Thoughts from the group?
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  #32  
Old 02-08-2019, 07:39 PM
mr.sun mr.sun is offline
 
Join Date: Aug 2006
Location: Wet, Western Washington
Posts: 127
Default High Fuel Pressure

I am still seeing intermittent high fuel pressure Skyview messages on my IO360 equipped -7. 2 new VDO sensors and new mechanical fuel pump make no change. Never see it after the first flight of the day. Thoughts?
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  #33  
Old 02-08-2019, 08:04 PM
F1R F1R is offline
 
Join Date: Nov 2010
Location: ____
Posts: 769
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Plumb in a flex line and a good quality mechanical fuel pressure gauge.

The only way know for certain what the actual pressures are.
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  #34  
Old 02-09-2019, 09:44 AM
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RV8Squaz RV8Squaz is offline
 
Join Date: Feb 2006
Location: Senoia, Georgia
Posts: 703
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I went through heck with erratic and high RPM and fuel pressure indications. I dealt with the RPM issues for over two years and the fuel pressure about 6 months. I have a Vision Micro Systems VM1000C. It uses a Hall effect sender on the magneto for the tach and a VDO sender for fp (fuel pressure).

These problems were very frustrating because I was doing all of the “right” things to trouble shoot and as soon as I thought I fixed it, the problems surfaced again. I checked connections and did continuity checks multiple timeis. I sprayed contact cleaner. I pulled on pins and wires. I replaced connectors. I replaced the Hall effect on the magneto twice. And fortunately, a friend of mine had another VM1000C display that I swapped out. The problem persisted. With only 3 basic components (the sender, the display, and the wiring), I had replaced everything except for the wires themselves. I doubted replacing the wiring would fix it because of the many continuity checks I had done. Finally, I replaced the three wire harness to include the pins on the display end, the Molex connector on the sender end, and the wires in between. I’m happy to report that the problem with my tach is finally fixed. As soon I was convinced that my tach was fixed, I replaced the wiring for the fuel pressure. And voilà, my fuel pressure was fixed. I wish I would have known it was that easy. I had been through three VDO senders and various connectors. The frustrating part was that I had done many many continuity checks while moving and jiggling wires.

Good luck and let us know how it works out.
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