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Old 10-10-2017, 04:15 PM   #1
SBCsavior
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I am currently in the middle of putting an 04 LQ4 6.0L ls in my wagon! It’s going to be naturally aspirated until I collect the parts to put a turbo on it. I know the stock Volvo pump will support a naturally aspirated engine. My question is do I need to plumb in a regulator? Or can I just hooking up the stock fuel lines and go?
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Old 10-10-2017, 05:16 PM   #2
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What does the LQ4 use for a regulator?

The stock Bosch pump can supply an LQ4? Didn't know that.
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Old 10-10-2017, 07:51 PM   #3
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If you are running a carb the max pressure should be no more than 7-8 lbs. The FI pump runs way more than that,so you need a regulator, switch in a low pressure electric fuel pump. If you are running the FI of the LQ4 check the fuel pressure of that motor.
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Old 10-10-2017, 08:39 PM   #4
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If you are running a carb the max pressure should be no more than 7-8 lbs. The FI pump runs way more than that,so you need a regulator, switch in a low pressure electric fuel pump. If you are running the FI of the LQ4 check the fuel pressure of that motor.
The lq4 requires 25-30gph @58psi. The Volvo pump puts out roughly 35gph. I can’t find a number on the psi it achieves though. I will be running the stock FI

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Old 10-10-2017, 10:49 PM   #5
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Stock is a 3.0 bar regulator but people have run 4 bar regulators from turbo dodges.
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Old 10-10-2017, 10:52 PM   #6
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Is there a regulator already on the fuel rail if you're going FI?
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Old 10-10-2017, 11:45 PM   #7
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The stock fuel rails on an LQ4 have a regulator built in
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Old 10-11-2017, 12:58 AM   #8
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The stock fuel rails on an LQ4 have a regulator built in
That's false. Some LQ4 have a returnless system. Those rails won't have any reg on them. I believe those started in 2004.

OP, post a pic of the drivers side fuel rail. If it has a reg that's where it will be. If it doesn't have one you will have to use a corvette filter/ regulator.
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Old 10-11-2017, 01:40 AM   #9
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That's false. Some LQ4 have a returnless system. Those rails won't have any reg on them. I believe those started in 2004.

OP, post a pic of the drivers side fuel rail. If it has a reg that's where it will be. If it doesn't have one you will have to use a corvette filter/ regulator.
2003+ LQ4s are returnless. Mine is from a 2004. No regulator on the fuel rail. They were in the tank of the trucks. Does anyone know how much fuel pressure the stock Volvo pumps create?
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Old 10-13-2017, 01:29 PM   #10
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Not sure on the pressure. A lot of returnless fuel systems use fuel pump modulation to vary the amount of fuel coming from the pump. Your stock pump will not like this if thats how the stock lq4 system works.
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