LTX and LSX Putting LT1s, LS1s, and their variants into Third Gens is becoming more popular. This board is for those who are doing and have done the swaps so they can discuss all of their technical aspects including repairs, swap info, and performance upgrades.

LS Fuel System

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Old Jan 4, 2020 | 12:45 PM
  #1  
Slow'86's Avatar
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From: Aurora, OR
Car: 1986 IROC-Z
Engine: 6.0
Transmission: 4L60E
Axle/Gears: 10 Bolt/3.43
LS Fuel System

Hello,

Recently purchased a 4.8 to throw in my Camaro (for now). First stretch of the project is dropping my rear end again, and replacing the metal tank with a fourth gen tank. I already have the replacement tank, but I was curious if I could somehow use my stock carb. fuel lines and save some money, or if I would be better off replacing them with the fourth gen lines?

Thanks!
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Old Jan 4, 2020 | 01:03 PM
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From: Cincinnati, OH
Car: '90 RS
Engine: 377 LSX
Transmission: Magnum T56
Re: LS Fuel System

If you are going carb why go through the hassle of replacing the tank? The stock lines are fine to use and since you're going carb the stock pump should be fine as well.
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Old Jan 4, 2020 | 01:05 PM
  #3  
Slow'86's Avatar
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From: Aurora, OR
Car: 1986 IROC-Z
Engine: 6.0
Transmission: 4L60E
Axle/Gears: 10 Bolt/3.43
Re: LS Fuel System

Oops.. should have specified better. I'm going with the stock LS EFI. I was wondering whether I could turn the metal third gen carb lines into my pressure lines.
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Old Jan 4, 2020 | 01:08 PM
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From: Cincinnati, OH
Car: '90 RS
Engine: 377 LSX
Transmission: Magnum T56
Re: LS Fuel System

Ah I gotcha, and yes the stock hard lines should be fine. You will need a 255+ pump depending on what power you are shooting for. Even if you use the 4th gen tank, it would be a good time to swap the pump. If you go larger than 255lph I would look into a hotwire kit (larger gage wiring to support the electrical demands of the pump)
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Old Jan 4, 2020 | 01:18 PM
  #5  
Slow'86's Avatar
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From: Aurora, OR
Car: 1986 IROC-Z
Engine: 6.0
Transmission: 4L60E
Axle/Gears: 10 Bolt/3.43
Re: LS Fuel System

Awesome, I'll go ahead and adapt my lines to the new fuel tank. I'll probably stick with a 255 pump, but I might as well upgrade the wiring while its apart. It's good insurance to do so.
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Old Jan 4, 2020 | 01:22 PM
  #6  
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From: Cincinnati, OH
Car: '90 RS
Engine: 377 LSX
Transmission: Magnum T56
Re: LS Fuel System

Just make sure you replace any rubber portions of the lines (at the junction of the tank sending unit and hard lines) with fuel pressure hose.
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Old Jan 4, 2020 | 02:03 PM
  #7  
Slow'86's Avatar
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From: Aurora, OR
Car: 1986 IROC-Z
Engine: 6.0
Transmission: 4L60E
Axle/Gears: 10 Bolt/3.43
Re: LS Fuel System

Gotcha! What would be best as a replacement? Would it be better to use something like steel braided line, or plastic line with quick disconnects?
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Old Jan 4, 2020 | 06:42 PM
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From: NJ
Car: 92 Firebird
Engine: 4.8 LR4
Transmission: T56
Axle/Gears: 3.45 9 Bolt
Re: LS Fuel System

I have a 4.8 with a 4th gen plastic tank. If you have the plastic lines and the metal junction from the 4th gen tank you can use a 4th gen filter and screw it right onto the 3rd gen hard line.This is what I did
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