Fuel pump wiring help
Thread Starter
Junior Member
Joined: Jan 2010
Posts: 11
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From: jesup,georgia
Car: 89 z28 iroc-z
Engine: 355 compcam vortec heads
Transmission: th350 10'' dayco 2800-3200 stall
Axle/Gears: 10 bolt with 2:73 upgrading soon
Fuel pump wiring help
Well trying to finish up my motor swap and all that's left is to get the fuel pump to come on. Someone cut the wires to the fuel pump under the car above the rear diff. here's a pic.
I need some help on how to rewire the pump. Can i just hook a hot-n-run wire to the gray wire going to the pump and ground the black wire out? Not sure what the purple wire is for. A little advice would be greatly appreciated. Also the wires that run under the carpet behind the back seat do they go to the fuel pump as well? Here is a pic 
I need some help on how to rewire the pump. Can i just hook a hot-n-run wire to the gray wire going to the pump and ground the black wire out? Not sure what the purple wire is for. A little advice would be greatly appreciated. Also the wires that run under the carpet behind the back seat do they go to the fuel pump as well? Here is a pic 
Thread Starter
Junior Member
Joined: Jan 2010
Posts: 11
Likes: 0
From: jesup,georgia
Car: 89 z28 iroc-z
Engine: 355 compcam vortec heads
Transmission: th350 10'' dayco 2800-3200 stall
Axle/Gears: 10 bolt with 2:73 upgrading soon
Re: Fuel pump wiring help
Bump, i know some one has got to know this.
Supreme Member
Joined: Sep 2002
Posts: 9,192
Likes: 19
From: Cary, North Carolina
Car: 1992 RS
Engine: Carbed 350
Transmission: 700R4
Axle/Gears: 3.42 posi
Re: Fuel pump wiring help
Fuel pump positive is the grey wire. Black is a ground. Purple is for the fuel guage sender.
Might as well just reconnect the three back to their counterparts so that the fuel pump relay is working properly, and the fuel guage is working properly.
Are you carbing this motor?
Might as well just reconnect the three back to their counterparts so that the fuel pump relay is working properly, and the fuel guage is working properly.
Are you carbing this motor?
Thread Starter
Junior Member
Joined: Jan 2010
Posts: 11
Likes: 0
From: jesup,georgia
Car: 89 z28 iroc-z
Engine: 355 compcam vortec heads
Transmission: th350 10'' dayco 2800-3200 stall
Axle/Gears: 10 bolt with 2:73 upgrading soon
Re: Fuel pump wiring help
Yes the motor is carb. I done got the pump to work im just wondering do i need the realy or can i just wire it to the ignition on the fuse panel?
Last edited by 89z28iroc-z; Jun 11, 2011 at 02:41 AM.
Joined: Dec 2004
Posts: 16,694
Likes: 979
From: Mile High Country !!!
Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: Fuel pump wiring help
I’m sure they figured it out by now, look at the post date
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