This thing gets wired into a few spots... The orange wire connects to the Fuel Pump Relay, Oil Pressure Switch, and to the ECM. The gray wire goes to the FPR, OPS, and the Fuel Pump. If I connected the orange wire to the gray wire, would that turn the fuel pump on when the oil pressure was up? Is that what I need to do?

 

This help:

 

can anybody tell me if the fuel pump will come on when you have no oil pressure?

 

the oil pressure switch will or should keep the car from starting not having any oil pressure

 

The oil pressure switch is merely a back up to the fuel pump relay. Should it fail, the oil pressure switch will supply power to the pump, given there is enough oil pressure to keep the circuit closed.

As long as the fuel pump relay is wired as it should be (in parallel with the oil pressure switch), and is working, there is no way the oil pressure switch can prevent the fuel pump from running.

 

Interesting. If this is so, then why is it when you turn the key in the on position (without starting the car), the fuel pump primes the engine for about 2-3 seconds, then immediately shuts off? What exactly kills the fuel pump's power? I mean, of course the ECM does.... but what exactly is telling the ECM to do so?

Please note that this is not a flame in any way whatsoever, I was just hoping you could elaborate as to why. I too have always thought that the oil switch killed the fuel pump's power when it didn't sense oil pressure...

Unless you guys are both right, and the concept is that as long as the engine has oil pressure (running).... then there's absolutely no way the oil switch can shut down the fuel pump, in fact, it can run the pump without the relay (providing oil pressure is being sensed). But, when it doesn't sense pressure, it, through the coil found on the top of the relay, kills the pump's power....

 

That is simply the fuel prime cylce that the ECM initiates. That ensures that there is enough fuel in the lines to start the engine. After that, the ECM will not power the pump, via the relay, until it sees a reference pulse from the distributor.

Thats the gist of it.

 

Excellent, thank you!

 

I am understood I do believe that this is the correct statment for this situation and sorry it took so long to get back to this .
ECM yep