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Patrick Kelley (Flion)
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Date:  7-21-2008
Number of Hours:  5.00
Manual Reference:  
Brief Description:  Fuel sender calibration

Using 5 and 1 gallon gas cans and the external pump, I calibrated the fuel senders for each tank. It is an artifact of the design of the tanks that the senders will read full when there is still room in the tank for more fuel. Therefore, for the BMA AD calibration array, I fudged the top three readings so that the senders will read 19 gal when absolutely full and 18 gal almost immediately when the floats start to move. Thereafter, the senders will operate normally but are not particularly accurate until the final 5 gallons. I expect the inflight accuracy to be even less as fuel sloshes about, so IT IS IMPORTANT TO REMEMBER THAT THE FUEL LEVELS ARE GENERAL INDICATORS ONLY.

In case it needs to be re-entered, the sender calibration matrices:
Gal Left Tank AD Right Tank AD
0 250 247
5 127 115
10 72 58
15 27 31
19 26 30
20 25 29

In attempting to set the tank limits and yellow and redline values, it was discovered that the redline values could not be entered; Blue Mountain Avionics will be contacted for help. The external fuel pump was removed and the line from check-valve to selector replaced. Also, a seep was noted under the right tank; it was determined to be the drain valve, which was tightened and the problem resolved.

Additional work: the fuel pump cover was painted and all but one of the firewall penetration shields were installd. The one not installed was for the lower ignition coil wires.
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