Bill Freeman wrote:

Ken,

I would be a LOT more concerned about vapor pressure increases
due to fuel heating than power losses.  The fuel density change might
account for a few percent power, but vapor lock will account for
roughly 100% power loss.  Seems very prudent to feed it back to the
main tank for cooling, esp if there is that high a bypass ratio.  The
Mazda folks must have intended the excess fuel to cool the fuel system
under the hood.

Bill

 
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