I have a manual shutoff valve plumbed into my FASS pump. Wanted to put in a electric shutoff valve inorder to close the valve from inside the truck. I'm having a hard time finding a 1/2" MPT thread,high flow valve,normally in the open position,but electrically activated to close.
I travel to some rough places and would like to have a means of disabling the truck in case of a carjacking............

 

try a place that sells propane their is a device used to cutoff the gas on converted trucks it might work dont know about the flow tho