280Z conversion to NA - stock Fuel Pump Safety Circuit

[Dkyle]

I have a 1977 280Z that the engine was replaced & converted to SU carbs.
I have kept the stock Fuel Pump, and it runs to a Holley FPR & back to the Tank with a back pressure line of 4psi when it runs.
I have separated out the EFI/Fuel Pump relay connectors from the EFI Harness and reconnected them back up to the relays.  The picture shows the current configuration.
I have a toggle switch now where the lines were to the safety switch that was in the Air Flow meter.
The pump now runs when the ignition is on "Start" & when the ignition is "ON" if i connect "39" to "36".

I should put in a safety circuit, but don't know how.  I assume I can buy a relay like the one in the picture.. & I assume I would connect lines marked "39" & "36" (that is now on a toggle switch) to the relay's pin 30 & 87.
What do i use as a signal to make the relay switch on? A +12V signal when the engine is running.. right?  Either from the coil, distributor or alternator?  In other words.. what do i connect to the relay's pin 86 & pin 85?

 

..or is there a better way to utilize what exist as a safety circuit.

[88dangerdan]

Don't know if this will help you out

But it helped me when I eliminated my mechanical fuel pump

 

Pulled it off the net

[Dkyle]

Did you employ the "inertia switch" ?

That circuit would appear to have 2 safety components.  Inertia switch normally closed until it receives a "whack", or there is no oil pressure.

I'm confused with the "Oil Press Switch"; is it used to trigger the relay when starting or when there is oil pressure? 

and.. if it works for you.. there must be sufficient oil pressure to activate the switch that, in turn, activates the relay as soon as the engine starts.