CC
Has a carb with a float. Float could have been forced down under excessive g creating flooding?
I don't think so. As the float gets heavier in the high g environment, the fuel it is displacing should get heavier also. The two should balance each other exactly out.
Stock P-51 fuel pressure appears to be in the 12-16 psi range with 19 psi max.
This is not such a high pressure that it could not be over-ridden at very high g.
The Stock P-51 used what appears to be a centrifugal fuel pump on the inboard aft corners of the wing fuel tanks (identified as the booster pump I believe.)
Sample calculations:
For 40 inches of height change (this is a SWAG* number), the pressure differential in a column of gasoline is about 1.04 psi.
At 15 g, the pressure differential in that same 40 inch column of gasoline is 15.6 psi. These numbers are the same orders of magnitude as the fuel pressure and indicate that interruption of fuel delivery may be possible at high g.
The Ghosts fuel arrangement was not stock, and the above calculations may not be relevant to the Ghost.
*For the uninitiated, SWAG = Scientific Wild Ass Guess.