I was guessing igniters. But this is close. Unusual though. There are several redundant fuel systems on aircraft. Mechanical, electric, and running off vacuum from the engines.
“There are several redundant fuel systems on aircraft. Mechanical, electric, and running off vacuum from the engines.”
Nope
“There are several redundant fuel systems on aircraft. Mechanical, electric, and running off vacuum from the engines.”
To give you a nice answer, considering the location of the switches and how they’re protected, it’s most likely that they shut off every source of fuel to the engine when they’re flipped. I suspect that there are other fuel switches (or display commands) that go into the operation of the system, such as the valves and pumps.