LT4 Fuel Pump in LT1

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Aug 2, 2024 | 02:10 PM

LT1GMC

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Drifting

Joined: Apr 2000

Posts: 1,390

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From: INDIANA

LT4 Fuel Pump in LT1

Does a LT4 fuel pump work with LT1 fuel rails in a LT1 engine? Upgrading for A&A supercharger addition and adding LT4 pump and injectors. I know the LT4 has different fuel rail but its for LT4 supercharger clearance. Not sure if any other reason.
Thanks!

Aug 3, 2024 | 07:27 AM

Dcasole

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Joined: Oct 2014

Posts: 8,673

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From: Atlanta GA

Quote:

Originally Posted by LT1GMC

Following as this is my next step

@Gary barnes 1098 Gary you did the LT4 upgrade right ?

Can you use LT 1 fuel rails ?

Dave

Aug 3, 2024 | 12:49 PM

douniasg

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Yes, I used the lt1 rail with lt4 injectors and pump. They do say to change the metal fuel lines. I have reused them without any issues.

Aug 3, 2024 | 01:45 PM

Dcasole

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Joined: Oct 2014

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From: Atlanta GA

Quote:

Originally Posted by douniasg

Yes, I used the lt1 rail with lt4 injectors and pump. They do say to change the metal fuel lines. I have reused them without any issues.

Thanks !

Dave

Aug 4, 2024 | 10:19 PM

TurboRegal84

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From: Southern NJ

Yes, you can reuse the fuel rails.

GM advises against reusing the small metal fuel lines. They have crush fittings and unless you really wrench down on them there is a risk of leaking.

Aug 5, 2024 | 06:18 AM

Dcasole

Le Mans Master

Joined: Oct 2014

Posts: 8,673

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From: Atlanta GA

Quote:

Originally Posted by TurboRegal84

Yes, you can reuse the fuel rails.

GM advises against reusing the small metal fuel lines. They have crush fittings and unless you really wrench down on them there is a risk of leaking.

Yeah , I am not going to reuse them

Dave

Aug 5, 2024 | 04:56 PM

TJay74

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Joined: Nov 2011

Posts: 3,715

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From: Norman OK

Quote:

Originally Posted by TurboRegal84

Yes, you can reuse the fuel rails.

GM advises against reusing the small metal fuel lines. They have crush fittings and unless you really wrench down on them there is a risk of leaking.

They do not have crush fittings, I have reused my fuel lines many times over now. They are a ball and seat design.

OP yes, you need to order the LT4 HPFP, the LT4 low pressure fuel line without the restriction orifice in it, you also need both of the LT4 hard fuel lines. The LT4 fuel lines have a much softer bend in the corners than the LT1 lines in order to maximize fuel flow to the injectors.

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