4th Gen Fuel tank - Third Generation F-Body Message Boards


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4th Gen Fuel tank

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Old 02-16-2017, 12:10 AM   #1
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4th Gen Fuel tank

I need some help/insight into installing a 4th gen tank in an early 3rd gen. Specifically, I have a 1984 Trans Am, I have a 4th gen plastic tank and fuel pump ready to go in the car. I have a sbc with fi tech fuel injection also ready to go into the car. My question is about pump wiring. I would like to wire the pump to a manual switch. Can this be done? My car was mechanical fuel pump, so I have no factory fuel pump wiring. Any insight is greatly appreciated.
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Old 02-16-2017, 12:35 AM   #2
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Re: 4th Gen Fuel tank

Of course you can. Use the switch to turn the fuel pump relay on/off.
Better question is, why? The key switch is a switch.... a fuel pump switch.

The link below will show you how the Racetronix Hot Wire kit is set up for that fuel tank.

http://www.thirdgen.org/forums/ltx-l...ml#post5151055
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Old 02-16-2017, 12:39 AM   #3
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Re: 4th Gen Fuel tank

For some reason the first time didn't show the bottom half of your reply. Thanks for the info!
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Old 02-16-2017, 12:42 AM   #4
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Re: 4th Gen Fuel tank

I did a ninja edit, that's why.
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Old 02-16-2017, 12:17 PM   #5
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Re: 4th Gen Fuel tank

I've done an LS swap in two '82 Berlinettas, both carb'd from the factory (no in-tank fuel pump). In one of them I used a 4th gen LS plastic tank with its pump. I had to run wires back to the pump in both cases. The factory runs the harness behind the rear seat back for an in-tank electric pump, but I ran mine along the rear chassis harness and out the fender well like the factory, then over to the tank.

You should power the pump through a relay, not just through a switch. A fuse is a good idea as well.

Why do you want to power it with a switch? I can see wanting to be able to switch the pump off with the ignition on, and vice versa, but that can get pretty old having to do that all the time. The FiTech should have a fuel pump command built into it - you can put an override switch in the relay command circuit if you like. (Which system are you getting? They all seem to have a fuel pump control feature.)
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Old 02-16-2017, 12:21 PM   #6
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Re: 4th Gen Fuel tank

I'm getting the 600 HP power adder system. I'm not set on what I want to do, I'm exploring options to see the best way to do it. I was unaware the Fi tech had a built in fuel pump command that could make things much easier. I'm just horrible with wiring systems.
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Old 02-16-2017, 04:59 PM   #7
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Re: 4th Gen Fuel tank

Quote:
Originally Posted by 84TA327 View Post
I'm getting the 600 HP power adder system. I'm not set on what I want to do, I'm exploring options to see the best way to do it.
From what they say about it, sounds like a good setup.

Quote:
I was unaware the Fi tech had a built in fuel pump command that could make things much easier. I'm just horrible with wiring systems.
From their website on the 600 HP PA system:
"All Go-EFIís feature Voltage Control fuel pump control. This feature reduces the voltage to the pump under low load conditions such as idle and cruise thus reducing noise and heat. This will extend the life of your pump and keep the fuel in the tank cooler and your ears from ringing!"
" Built in Fuel pressure regulator. No extra regulator to mount on your fire wall."
The 4th gen tank has a 58 psi regulator built into the return. You'll probably want to defeat that, but you should run a return with it (factory-type in-tank electric pumps need constant flow to keep cool).

Wiring isn't as difficult as we work ourselves up to believing. The analogy to plumbing is valid - you're just building pipes for electrons.
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Old 02-16-2017, 05:12 PM   #8
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Re: 4th Gen Fuel tank

I didn't know that it had a fuel pump control built in to it, perhaps I should have read all of that a little closer.

I planned on running a full braided fuel line to the throttle body and a full return. So I'll be using their built in regulator.

Thanks for all the info, hopefully I'll be able to get this all done soon!
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Old 02-16-2017, 06:14 PM   #9
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Re: 4th Gen Fuel tank

I'll have to back off of my relay recommendation. Their fuel control can handle the voltage load, unlike a switch, so nix the relay part.
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