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Old 06-18-2003, 06:58 AM
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Question Holley 4150

Hello,

I have a Holley 4150 carb that needs to have 6-6.5 psi for the fuel so holley tech's tell me. I have e-mailed them back and have gotten on responce from them. So let me ask you all. This carb is on a 1972 chevy 350 should i use a red or blue fuel pump on this carb. I have heard that line psi is 5 for the red pump. will the red work for me? This engine came out of a camero and is going into my 46 Ford coupe.
Please let me know what you all think!

Thanks,
Steve
:skeptic:

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Old 06-18-2003, 07:32 AM
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Red? Blue? How about Chrome or Purple?

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Old 06-18-2003, 07:47 AM
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I have a red pump and it puts out 6-7 psi. Pressure is adjustable at the pump relief spring.
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Old 06-18-2003, 09:09 PM
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I have used only the blue pump...but I also use a regulator..Im not sure if you need a regulator with the red pump, but holley's can withstand 7 psi, after that the fuel has a tendancy to by pass the needle and seat....
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Old 06-19-2003, 12:52 AM
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I use a regulator with a return bypass on my red pump, keeps the pump cooler.
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