Fuel System Wiring

GreenMustang00 · Jun 5, 2012

Okay so now with the 393w carb swap I took out the engine harness. I am now down to the last part of the wiring and hit a small road block. I am trying to use a relay and tap into the wiring for the stock fuel pump so when I turn the key it will purge the pump. (I have an inline pump). We tested all the wires and didnt seem to get power to any back there. Any ideas? reps for help

We did check fuses

bulloch27 · Jun 5, 2012

If the computer is gone... there won't be any power going to the box for the fuel system. Returnless system is controlled by the ECU.

keep in mind my suggestion is based on almost zero comprehension of electrical systems. I'm just tossing you an idea.

bluebandit! · Jun 5, 2012

Is the pump stock in the tank? Is the relay currently wired in? Is this a stock relay in the fuse box?

GreenMustang00 · Jun 5, 2012

Stock wiring is untouched. The pump is inline.

Sent from my SCH-I500 using AutoGuide.Com Free App

bluebandit! · Jun 5, 2012

As bulloch said the stock returnless fuel pump is controlled by the ECM and without an ECM the pump isn't getting a signal for the pump to turn on

SSG Pate · Jun 6, 2012

What are you using as a trigger for your relay? you need to find a wire that you can use for a trigger that does not cut off while you are cranking the car.

GreenMustang00 · Jun 6, 2012

I believe I went with these four going into the relay.

-Battery
-Ground
-Fuel Pump
-Then one running to the fuel pump wiring harness(place where I can't get power)

I am thinking about just hard wiring my own power source to a switch now. I didn't really want to get alot of switches but 2 will be fine3

SSG Pate · Jun 6, 2012

You have a dead trigger find you another source to trigger your relay and our pump should come alive again.

Fuel System Wiring

GreenMustang00

bulloch27

bluebandit!

GreenMustang00

bluebandit!

SSG Pate

GreenMustang00

SSG Pate

Top Contributors this Month

Recommended Communities