Why do many aircrafts do not have a Both fuel selector?
#1
Planes that have wings that are lower than the engine (low wing planes) generally have to pump fuel up to the engine. They usually have a fuel selector that has Left, Right, and Off as options.

Planes with wings above the engine (high wing) usually have Both as an option. The two tanks feed into one spot via gravity.




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#2
More technical explanation here.

But I did not read it thoroughly.




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