Thanks for the partial credit Bula but as with all things Airbus its not as straight forward as it appears. The HP valve is opened by FADEC during an automatic start and when certain conditions are met during a manual start one of which is the position of the eng master. During shutdown its the position of the LP valve that determines whether the fuel continues downstream. If it is closed then the engine will eventually shutdown which is why Airbus only give you the position of the LP valve on the schematics.
I totally agree with your last statement but I am aware of more people that have come unstuck operating outside of FCOM than operating inside FCOM.