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Wednesday, 3 June 2026

Tank Calibration and Transfer Pump (Aux to Main tanks)

I had not calibrated my tanks in a level attitude.  As a stop gap I put the same cal values from a tail low attitide into the level attitude column.  I needed to find a way to have the aircraft stable while doing the calibration... it takes awhile.

Qty 3 2x4's, and a cheap boat winch.


Calibration done, except the right aux tank.  The transfer pump died.  New one ordered (plus a spare).

This is when everything went wrong.  I took the pump out, verified it was dead and went to put it back in so I could fly.  Somehow I cross threaded the Swagelok fittings.  I tried to repair the threads, and was successful EXCEPT on the fuel line side.  Can't get it off.  So had to change out the right wing to flex hose.  Now everything is just standard AN fittings.

Now I have to do the left wing one day... not a hard change when required.

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