Hi Guys,

there are all sorts of reasons to place the shut of valve before or after the pump. Personally unless you can reach it easily without unbuttoning the aircraft then it is usless except in the fuel filling stage, to prevent kero from entering the engine.

The foolproof way is to interrupt one fuel pump wire( positave or negative doesn't matter) fuel pump wire with a small micro switch , servo operated on a separate channel, therefore if it is all going pear shaped you can flick a switch and shut the pump down . the rest of the electronics then take care of themselves. I mix this to my throttle trim, this way you never forget to turn it on.

Rgs

Norm T