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Discussion Starter · #1 ·
A little help here...please! I'm 2 months in and new to all this.
I have an SBC bored .040 over with a dual quad set up running (2) 4160 carbs and a tunnel ram intake. The truck is a '53 Chevy swap to a '99 s-10. I am still running the stock pump with a Holley 12-877 fuel regulator.

What is the pressure supposed to be for this kind of set up?
Do you recommend the Aeromotive EFI to Carb Dual Stage Fuel Pressure Regulator? I can't seem to get the pressure to stay below 11 psi. It creeps up after I turn it down.

Thanks for the help
 

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True Hotrodder
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1,955 Posts
7-7.5 is more than enough. You said stock pump - what 's the output pressure on that? That Aeromotive regulator would probably handle the problem. I'm not familiar with the EFI on a Chevy that much, but would assume you're in the 50 psi range? A normal carb fuel regulator cannot handle that kind of input pressure.
 

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More for Less Racer
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'99 S-10 chassis I would assume it is in-tank EFI pump?
Was it individual port injection or a throttle body injection originally? They operate on vastly different pressures.

Holley 12-877 does not come back as a good number for a fuel regulator....it is shown as just a "Fuel Pump Module hanger shim"....clearly not a regulator.
 
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