This straight from the AMA 510-A document:

8. ... The fuel system shall have two fuel shut-off provisions, one of which is manual and the other one must be remotely operated. An ECU operated shut down is compliant as a remote shut-off if it closes with loss of power.


If the ECU is compromised, it might not have the ability to de-energize the fuel solenoid. Also, as most of us have found out, the solenoid by itself won't necessarily prevent fuel from being pushed passed it and into the turbine while fueling.