**********************************************************

     2.      The pump relay is activated by a signal from the ignition
     pulse indicating that the engine is either cranking or running.  A
     switch from the oil pressure sender can also be incorporated as a
     secondary source of power to the fuel pump relay.   Either one will
     independently allow the engine to start and run.   An engine
     stoppage will cause both to turn off the pump.
*************************************************************

Joel,
 This might be a useful safety measure in some circumstances, but if I
built in any "safety" device that might inadvertently shut down the fuel
pump in flight, I'd insure that I at least provide a manual bypass switch
that would become part of my "engine restart" checklist.   I'm still not
sure this  safety measure enhances safety in the aircraft application.

Mark Waldron


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