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Originally Posted by jdm_s14_zenki
why in the hell would the ecu need to shut off fuel? so you can go lean and detonate?
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I hear you on this, but you also have to balance this with the fact that any time you recommend a modification, you have to understand how the system as a whole will be affected. You have to look at how the wiring is done. It has to be clean, and provisions has to be made for safety.
The fuel pump circuitry sits on its own line. You need to clarify that if you piggyback it onto the existing ignition wiring, you have to look at the maximum load the system currently expects to support. Then you add in the maximum load the fuel pump is expected to draw. If the sum of the two max loads exceeds the max capacity of the ignition circuit, you're going to have problems.
So until you have addressed those questions, it's not good to say just piggyback the fuel pump onto the ignition system.
The best way to do that would be to use a relay and tap into the ignition system as a power source. Only a small current will be drawn to activate the relay, which draws a large current from a different circuit. This is how the stock system works.
And actually all you would need to do is take the wire that goes from the fuel pump relay to the ECU and slice it in half. Remove/tuck away the side that goes to the ECU. Ground the side that goes to the relay. Now the relay thinks that the ECU is always turning the pump on. Much easier and safer than trying to piggyback onto another circuit.