LS Swap. Need to figure out power for pumps.

[JSTEWY]

I am having trouble seeing which wire/s I need to supply power to run the pumps. Four wires coming from the pumps. Two into the fuse block and two into the fire wall. Anyone know for sure before I start pulling wires and testing? 1987 Chevrolet V30

 

[foamypirate]

I am having trouble seeing which wire/s I need to supply power to run the pumps. Four wires coming from the pumps. Two into the fuse block and two into the fire wall. Anyone know for sure before I start pulling wires and testing? 1987 Chevrolet V30

Tan w/ white stripe going into the fuse block. There is another set of two tan w/white stripe coming out of the bulk head that runs over to the firewall behind the engine. This feeds into the dash switch itself. You want to tie into the single tan/white going into the fuse block, not the 2 coming out.

 

[JSTEWY]

Tan w/ white stripe going into the fuse block. There is another set of two tan w/white stripe coming out of the bulk head that runs over to the firewall behind the engine. This feeds into the dash switch itself. You want to tie into the single tan/white going into the fuse block, not the 2 coming out.

So I have one tan/white that comes from the harness that goes to the pumps that goes in the driver side of the bulkhead. I have another that originally came from the pump relay in the passenger side of the bulkhead. And there is also one that y's off from the two wires that go through the fire wall. Am I looking at the bulkhead or the two wires going through the firewall?

 

[foamypirate]

So I have one tan/white that comes from the harness that goes to the pumps that goes in the driver side of the bulkhead. I have another that originally came from the pump relay in the passenger side of the bulkhead. And there is also one that y's off from the two wires that go through the fire wall. Am I looking at the bulkhead or the two wires going through the firewall?

You'll want to tie into the tan/white that came from the original fuel pump relay and into the bulkhead. I believe that was the one on the passenger side. The other tan/white that runs down along the frame rail is for a single tank setup, and is unused if you have dual tanks (it terminates in a connector with no contacts, and is taped up in the harness, if I recall).

I'll try and snag some pictures of my bulkhead for reference when I get home.

 

[gmachinz]

I've got NEW harnesses available.....new dash switch, 65 psi valve, wiring, ect if you want to go all NEW.

 

[JSTEWY]

You'll want to tie into the tan/white that came from the original fuel pump relay and into the bulkhead. I believe that was the one on the passenger side. The other tan/white that runs down along the frame rail is for a single tank setup, and is unused if you have dual tanks (it terminates in a connector with no contacts, and is taped up in the harness, if I recall).

I'll try and snag some pictures of my bulkhead for reference when I get home.

Thanks man, wired up and both pumps running. She runs and sounds angry lol. I can't get any communication with the ECM. I have 12+ and grounds connected. Pin 2 (ppl wire) connected to Pin 58 Blue ECM connector. Any suggestions?