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I did this on my old car, 400hp s13. The car was so easy to break into it's ridiculous so I figured I would just leave it unlocked and let someone try to figure out how to start it.
The way I did it was by cutting the wire that went from the ecu to fuel pump relay. The ecu would ground the relay in order to prime the lines, then ground fulltime when the engine was starting/on. I used a 2 pole switch hidden in a certain location to manually ground the fuel pump relay.
So, whenever I got in the car I had to put the key to the on position and wait a few seconds, then start it, because the relay was no longer controlled by the ecu, just by the ignition and switch.
When I parked somewhere shady, I would just wait until the turbo timer counted down then flip my little hidden switch over. If someone tries to start the car the fuel pump will do nothing whatsoever.
If I were to do it again, I would switch the power wire to the pump and not the ground, so the priming function would still be activated by the ecu, but even if the ecu was telling the pump to run, it wouldn't be getting any power unless the kill switch was on.
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