Nissan Repair: Safety Relay, electronic fuel injection, hitachi components

Question
I have an '87 Pathfinder with the Z24i engine. I have some questions concerning the safety relay in the fuel injection circuit:
-how does it work?
-what is it's purpose?
-could it draw enough current to kill my battery?
-what resistance should the control circuit have?
-can I run without it?
-will to high a voltage hurt the injectors?
Thank You  

Answer
Terry,

The relay just shuts power off to the injectors when the engine is off.  And, remember that it is only the potential for a current path since the injectors only work when the computer allows them to be grounded.  And, this will happen only when it is appropriate.  The safety feature is that when the car is off the injectors will not stick open and flood the engine with gasoline.  The electronic circuit design is a basic standard on electronic fuel injection.  Lastly, remember that Bosch invented fuel injection and this is one of the best versions of it.  Nippondenso fuel injectors with Toshiba and Hitachi components does not get any better.  A very robust system that I would not modify so it does not drain the battery and there is really no resistance in the circuit.  It only allows the electrons to flow when the computer wants them to...