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Old 06-27-2020, 01:41 PM
n8433w n8433w is offline
Join Date: Jun 2011
Location: PA
Posts: 20
Default Struggling to set up fuel levels on GRT EIS 4000

I am working to set up my EIS 4000 and Sport SX fuel level display with resistance type senders. I have added the 1/4 watt resisters and exciter circuit as described in the GRT manual but no mater what the fuel level is the display reads the same number 12 gallons based on the current settings on min 3 and max 19 that I entered in the Sport SX. If I reverse the direction of the read the quantity is always 0 no matter how much fuel is in the tank.

Can anyone suggest what I have done incorrectly in the installation or settings?
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Old 06-27-2020, 01:47 PM
Mike S's Avatar
Mike S Mike S is offline
Senior Curmudgeon
Join Date: Sep 2005
Location: Dayton Airpark, NV A34
Posts: 15,264

Set the scale and offset factory yet??
Mike Starkey
VAF 909

Rv-10, N210LM.

Flying as of 12/4/2010

Phase 1 done, 2/4/2011

Sold after 240+ wonderful hours of flight.

"Flying the airplane is more important than radioing your plight to a person on the ground incapable of understanding or doing anything about it."

Last edited by Mike S : 06-27-2020 at 01:49 PM.
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Old 06-27-2020, 02:26 PM
n8433w n8433w is offline
Join Date: Jun 2011
Location: PA
Posts: 20

Yupp .... sure did, set the scale factor to 100 and the offset to 0 per the instructions.
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Old 06-27-2020, 05:11 PM
BobTurner BobTurner is offline
Join Date: Dec 2011
Location: Livermore, CA
Posts: 6,583

Start with basics.
Power off, disconnect the center wire to the float sensor. Put an ohmmeter on the center screw, and the other lead on ground. If the tank is empty, it should read about 30 ohms; if the tank is full, about 230 ohms.
Make sure the sensor has a good ground connection, NOT to one of its mounting screws (these get covered in sealant and sometimes make a poor electrical connection.)
If it reads 30 ohms when full the sensor may be stuck. Some people have rapped the mounting plate or tank bottom with their hand, and had it come unstuck!
Next, re-connect the center wire and turn on aircraft power. Put your meter on volts, measure center connector to ground. You should see a very small voltage if empty, and about 2 volts if the tank is full.
Repeat with the other tank.
If it passes these tests, then it?s the software set up.
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