280z l28et MS wiring

[Autismisakiller]

I am trying to figure out what wire goes to the fuel pump and where it is located? I already tried looking at wiring diagrams but they are not specific enough.

Edited September 14, 2013 by Autismisakiller

[claude]

Do you really want the Megasquirt ECU to control the fuel pump? AKAIK the stock wiring turns on the pump when the ignition is on without any input from the ECU. If you turn the ignition off whenever the engine isn't running you would be manually controlling the fuel pump just the same as the Megasquirt does.

 

If you want to find the fuel pump wire without the wiring diagram, start looking at the fuel pump for one end of it and trace it back.

 

 

Here is what I would expect based on my Australian delivered 260Z.

 

There would be two wires connected to the fuel pump.

 

One wire would go to earth which you can test for continuity to the body using a multimeter (best done with the ignition off). Its most likely black. Talking about the wiring harness side, might be another colour on the pump side of the connector. The earth wire probably splices to a few other earths and is bolted to the body somewhere in the rear hatch area near the taillights.

 

The other wire is your positive wire which runs up into the cabin, under the right front seat and splices to the main ignition power wire somewhere near the fusebox.

 

Hope that helps.

[loy]

http://www.diyautotune.com/images/msharness/mswiring.png Pin 37 Violet is Fuel pump signal. Wire it to a relay as shown.

Edited September 14, 2013 by loy

[Autismisakiller]

First of all thanks for the help. Next, yes I want the fuel pump controlled by the MS because the stock wiring harness is completely butchered. I appreciate the help.

[Metro]

I used the large 4 pin plug under the dash to hook into my 76's harness. You only need two of the wires connected to it. One supplies 12v when the ignition is on, the other carries power to the fuel pump (might be green with blue).