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The larger tank was placed upside-down to clear its bulge from the fwd canopy. Thanks for the tip, Raja!
Adding the second, 16-oz tank to the Spectra significantly increases endurance. The chosen layout - stock tank near the engine and 16oz under the battery tray - allows the stock tank to remain visible. Since it only starts draining when the larger tank is empty, it is a good visual indication of remaining fuel. Also, this layout allows very short fuel lines, both from aux to main tank and from main tank to the engine.
Fuel system diagram - updated to better depict actual fuel line layout
| Looking down from RH side of heli
| Looking aft
| Looking right, from LH side of heli
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Looking right/aft, from LH side, near the fwd/left canopy mounting post
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 | Dial indicator |  |
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