Discussion Starter · #21 ·
What would you think about wiring up the fuel pump to a completely new fuse and relay that only had power with key on?Without looking at details of wiring diagram for a 87 the computer primes your pump for 3 seconds with key on then once started the oil pressure switch activates the relay once running. The ignition signal from distributor tells injectors to open / pulse. With the computer not getting signal i dont know if it would shut down the pump relay or not. perhaps the yoda of wiring diagrams @oldeerslayer can enlighten.
My way of thinking and i may be way wrong: Use the oil pressure switch to trigger the electric pump relay, which it already does, for a safe way of operation. No oil pressure no pump. With a carb you should have plenty in the bowl to get it started and build pressure for the switch to activate the relay. There is also a prime terminal under the hood for the pump if the float bowl is dry. I am not sure it works if computer for all intents and purposes is gone.
To me the saftey issue is you do not want the pump running without engine running.