R32 Gtr fuel pump wiring

[Thrillhouse]

R32 Gtr fuel pump wiring

Hey there, I have a r32 Gtr which is running a nismo lift pump to 2 Bosch 044s and a surge tank. I've wired all three pumps up to new relays all getting power source from the battery in the boot. Each pump has their own earth which are solid, sort and to bare metal. During my wiring of the pumps I removed the factory pump relay. I just need a hand getting the right switch feed for my relays. I'm currently using a 12v accessories wire in the boot as the switch wire for the relays so the pumps receive 12v as soon as the keys are on accessories. What I'd like to know is which wire should I use for the switch of the relays ( I thought it was pin18 black and pink) out of the ecu but that wire has no power from it. Any assistance would be great for what wire people use from the ecu. 

Cheers

[KiwiRS4T]

Can you not use the wire that went to the factory relay?

[GTSBoy]

ECUs don't generally output power to run shit.  The sink the switched circuit to earth.  Ie, the switched pin on the ECU is usually N/C when not active, and earthed when it is active.

[Thrillhouse]

40 minutes ago, KiwiRS4T said:

Can you not use the wire that went to the factory relay?

My understanding was the factory wire was the black and pink one but it doesn't see any power.

[Ben C34]

Because the ecu earth's it out to trigger the relay. I can't think of an ecu that puts a voltage out to trigger a relay.

As per the post before yours.

[Ben C34]

Also, the relay main power should go direct (woth a fuse) to the battery, not through another relay or accesories. What you have done sounds wierd.

[Thrillhouse]

3 hours ago, KiwiRS4T said:

2 hours ago, Ben C34 said:

Also, the relay main power should go direct (woth a fuse) to the battery, not through another relay or accesories. What you have done sounds wierd.

Yeah I have each relay getting power from a fuse block I have in the boot all with 50amp wiring. My current trigger wire I'm using is a 12v acc wire which is turning the pumps on. They are all turning on fine I just wanted it to be correct.

[GTSBoy]

The relays should have power direct from a fused supply on one side of the coil, and the other side of the coil should go to the ECU pin.  They are then switched on the earth side, like they're supposed to be.

[r32-25t]

So as soon as you turn the ignition on the fuel pumps starts running constantly?

[Thrillhouse]

5 hours ago, r32-25t said:

So as soon as you turn the ignition on the fuel pumps starts running constantly?

Correct. It's currently wired like the picture with the trigger getting 12v from the ignition.

[GTSBoy]

So hook terminal 85 to the ECU already.  Why is this still a thing?

[r32-25t]

Do yourself a favor and get a professional to do it cause what you've done is wrong 

[inmaniac]

10 hours ago, Thrillhouse said:

Correct. It's currently wired like the picture with the trigger getting 12v from the ignition.

This is bad and unsafe. As someone else mentioned, should probably get a pro.

In case of an accident you don't want pumps running, which they will be if getting trigger from IGN/ACC.

[Thrillhouse]

 I've just removed the constant earth off the relay to the ecu trigger as my understanding was wrong. Thanks for your help guys.