Sounds like you have some inaccessible bays in your wing or wings.  Could be you have more fuel in the wing but some can't get out or a bay could be plugged totally and only have air.  Either way it's not good. Likely happens from too much Hysol at wing closure.  Can you get a scope to check the ports inside the wing?  Would be good to have access to a fuel bouser to pump fuel into and later pump it back in 5 gallons at a time to re calibrate once you get things figured out and ports cleaned out if needed.

Good luck,
John Barrett

Sent from my iPad


On Jul 19, 2013, at 4:22 AM, Charles Brown <browncc1@verizon.net> wrote:

> I may have provided some bad info in the past.  I stated that the fuel vol in my wing tanks was 37 gal per side; attributing the extra to the complete absence of speed brake provisions.  However, I just got around to exhausting a fuel tank in flight, and refilled it with 34 gallons.  Of the many possible variables, the one that seems most dubious is the accuracy of the 1/2 gallon measuring cup that was the basis for the original calibration.  I"m still sorting through this one.
>
> Charley Brown
> Legacy 275 hr
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