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  #1  
Old 10-14-2021, 10:40 AM
ExtraKatana's Avatar
ExtraKatana ExtraKatana is offline
 
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Location: Broken Arrow OK
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Default EI Fuel Gauge Issue Capacitive Plates

FL-2CA Dual Fuel Level Gauge.
Just replaced the IMC module on the Starboard side. Sprayed electronic cleaner in every elec connection reachable. Re-calibrated by adding fuel in 3 gal increments. Did this because I was getting a high reading on the starboard side. Like 19 gallons when I had 10. Worked great for 15 minutes of flight now I’m stuck on 7 gallons reading when I know I have 15.
Same fuel used to calibrate was used during flight so I don't think "different fuels" causing a different capacitance is the issue.

Anyone been there?
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Last edited by ExtraKatana : Yesterday at 03:00 AM.
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  #2  
Old 10-14-2021, 11:00 AM
rapid_ascent rapid_ascent is offline
 
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What type of fuel are you using? You might buy a multimeter that measures capacitance then you could at least look at that part of the problem. That might help you to isolate what's going on.
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  #3  
Old 10-14-2021, 11:22 AM
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ExtraKatana ExtraKatana is offline
 
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Default 100LL

Using 100LL. Occasionally mix in Non-E Mogas but rarely.
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  #4  
Old 10-14-2021, 12:31 PM
rapid_ascent rapid_ascent is offline
 
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Be aware that different fuels have different dielectric constants so the capacitance will change. I know that for 100LL it is twice that for air. I'm not sur e of the specifics for other fuels. My point is don't plan on your fuel gauges working correctly if you are changing fuels. I'm not sure if you are already aware of this or not, just letting you know.
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Ray Tonks
2020 Donation Paid
Titan IOX-370, Dual PMAGs, 9.6:1 Pistons, FM-150
RV-7 Fuselage in progress
* Cabin Interior - In progress
RV-7 SB Wings
* Both Wings fully skinned
* Fuel Tanks Complete - No leaks finally
* Ailerons Complete
* Flaps Complete
RV-7 Empennage - Complete (a little fiberglass work left)
Vans Training Kit # 2 - Complete
RV-7 Preview Plans
Vans Training Kit #1 - Complete
EAA Sheet Metal Class - Complete
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  #5  
Old 10-14-2021, 12:47 PM
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ExtraKatana ExtraKatana is offline
 
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So I recalibrated the instrument by adding 3 gallons at a time and locking in the new sensor number for that fuel level. Sensor numbers increased as they should as fuel increased. All was fine for first 15 minutes of flight. the same fuel was used during the flight as was used to calibrate the instrument. There was a big change also. From 16 gallons down to 5-7 in an instant. Now I'm stuck on 7. Cleaned all the connectors and reattached.
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Last edited by ExtraKatana : Yesterday at 02:57 AM.
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