I think some of the major alarm installers do such a thing - at a price.
What about an electric fuel valve? Situated near the tank it would allow the vehicle to run for the time it takes to use up the fuel in the pipe.
You could have a switch hidden in the cab which you could flick easily without being noticed in the event of a carjack while you are inside. You could switch it off when leaving the vehicle.
It has occured to me that the most vulnerable time is when you return to your vehicle with your keys in hand. If your keys were stolen then the vehicle could be started and driven off, but would stop up the road.
VWP - fuel filters, fuel pumps, fuel valves
Like this. Only around £50
Clive
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