Now there are rumblings in the interwebs about fuel vapor lock.

Seems unlikely with kerosene, and given our pumps all have a pretty good pressure head to begin with, but it was a very hot day. So maybe a load of hot fuel from the supply tank combined a hot airplane, and hot engines if the plane had just turned (it did IIRC) could get you closer to those margins.

Also possible that local fuel quality was problematic, for example if it got mixed with other fuel. Gasoline boiling point would be way lower, and even road diesel can vary widely and worst case could be similar to gasoline.

Fuel would not have to actually reach sea level boiling point, but a lower boiling point would make it more susceptible to boiling in the pump due to low pressure. Probably more likely on the engine pump as opposed to tank pumps.

Airport fuel systems *typically* should have filters and even detectors for particles and water. But not sure if they would detect wrong fuel or mixed fuel.

But I'm not sure how you get enough thrust to get to V1, and then have vapor lock manifest after. Seems like it would happen when they set TO thrust, due to high fuel flow.