DV, very interesting but surely the phrase 'fuel defect' is wholly ambiguous.
For instance a fuel defect may be the erroneous indication of a fuel flow indicator to a fuel tank problem.
'A fuel tank problem' was how the failure of a test launch of the Thor missile was described. The actual problem was the failure of the bottom of the fuel tank to lift off at the same speed as the rest of the missile.
In other words, lies , damn lies and . . .