Charcoal lighter fluid, known as LF-1, was used in the Pratt & Whitney J57 engine, which powered the Lockheed U-2 aircraft.

Charcoal lighter fluid is made of Benzene, naphthalene, petroleum distillates, toluene, xylene

https://en.wikipedia.org/wiki/Charcoal_lighter_fluid#:~:text=Charcoal%20lighter%20fluid%20%2D%20Wikipedia,chimney%20and%20electric%20fire%20starters.
https://upload.wikimedia.org/wikipedia/commons/9/95/Usaf.u2.750pix.jpg