Originally Posted by
KC36330
the solenoid provides a means of immediately stopping fuel flow to the turbine. shutting off the power to the fuel pump doesn't immediately stop the flow of fuel.
A turbine will not continue running without fuel pressure. If the pump stops the engine stops it is that simple. I have run engines many times with manual start and stopping the fuel flow stops the turbine.
Have a look at this video and the problems manually starting 6 engines but they all stop instantly when at the end of the video the fuel pumps are stopped. There are no solenoids on this plane but there are 6 manually operated valves.
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https://www.youtube.com/watch?v=9NmhlhZgLjA
John