BlackhawkSP
Well Known Member
I went flying 2 days ago. I have a 3 screen G3X touch with all Garmin goodies throughout. I noticed my fuel pressure bar graph just showed the white triangle at the top of the bar, with no number readout. Next day I pulled the cowl. I noticed when I unhooked the connector to the sensor (It's the Kavlico P4055-50G 0-50 PSI sensor). I noticed that the grommet around the wires was pushed out (more on this in a minute)?? Turned things back on & the Fuel Press was Red X'ed out as expected, so I looked at the pins on the connector to make sure they hadn't pushed back and reconnected then turned on the boost pump to check and had the same result. Disconnected the connector again and there was fuel inside the connector!! Sure enough the sending unit had failed mechanically and fuel was pushing out around the connecting pins on the sensor. With the connector unplugged I turned the boost pump back on and it was shooting out a nice stream of fuel onto the back of the engine. This is what pushed out the grommet from around the wires going into the connector. This is why you should always have the small orifice restrictor on the sending line from the pump, to limit the amount that will flow through any leak. This was dribbling fuel down my firewall for almost an hour flight. I'm posting this as a lesson learned and to remind folks that a wonky reading on this sensor might mean you're leaking fuel into the engine compartment. The Garmin guy I talked to said he's seen this before. Just a word to the wise.
Edit: I posted this below, but here's a video.......https://www.youtube.com/watch?v=9P8PoiP7Gx8&feature=youtu.be
Edit: I posted this below, but here's a video.......https://www.youtube.com/watch?v=9P8PoiP7Gx8&feature=youtu.be
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