This really doesn't apply to planes with multiple tanks, as the fuel
shutoff generally does double duty as a selector.  But I have only one
tank, so the cutoff valve is really only useful in case of an engine
fire or in preperation of an emergency landing.

With a fuel pump that blocks flow when it isn't running, what useful
purpose does the cutoff valve serve beyond increasing pilot workload?
Won't cutting power to the fuel pump provide the same service and
eliminate several failure modes?

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