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Old 04-26-2011, 06:42 PM
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What fuel pressure are you running in your Holleys?

I'm having issues with two different cars, both have the same 350 SBC with holley 1850 carbs, both have the stock chevy no return fuel pump.

do this pumps make too much pressure for the holley carbs?

what pressure do this carbs like?

edelbrock performer RPM goodies on both engines.

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Old 04-26-2011, 06:55 PM
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Quote:
Originally Posted by Augusto
I'm having issues with two different cars, both have the same 350 SBC with holley 1850 carbs, both have the stock chevy no return fuel pump.

do this pumps make too much pressure for the holley carbs?

what pressure do this carbs like?

edelbrock performer RPM goodies on both engines.
Holley recommends 5-7 psi at idle, and a minimum 4 psi at engine redline.
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Old 04-26-2011, 07:14 PM
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I run a return pressure regulator and hold 5.5 psi across all RPM
Best $75 I ever spent.
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Old 04-26-2011, 07:39 PM
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NAPA
Part Number 40987
Description Fuel Pump (OE Mechanical Type)
Attribute Pressure Rating:7 1/2 - 9 PSI,Gallons Per Hour:40 GPH @ 1800 RPM,Fitting Type(s):Inlet - Tube, Outlet - UNF - 2B Inverted Flare Threaded Fitting,Fitting Size(s):Inlet - 3/8", Outlet - 5/8 - 18 UNF - 2B
Comment w/ 2 Line Pump

Most Holley 4-bbl's want to see a maximum of 8 PSI, so I'd say that a regulator would be a good idea with this pump.



Holley 12-803 (Includes mounting bracket. Guage sold seperately.)
Pressure range 4.5 to 9 PSI

According to the Instruction sheet it can be plumbed as a dead-head or fuel return to tank.
Dual ports allow for 2 fuel lines to carb, or mounting a guage.
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Old 04-27-2011, 02:47 AM
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I use an intank TBI pump (13 PSI) Regulated down to 6PSI Across all RPM. Works great.
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