Carbureted Fuel Pressure Regulator

Street/Strip Carbureted Applications Two Port Adjustable from 4.5 to 9 PSI

PART# 12-704

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Estimated shipping date: 03/01/2019
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*** 1 1/2" NPT to AN -8 and 2 1/2" NPT to AN -6 For AN style fittings included


Holley fuel pressure regulators are designed to precisely control the fuel pressure from the fuel pump to the carburetor. Too much fuel pressure for a given needle and seat assembly can overload the needle and seat and may cause flooding or drivability problems. Each Holley fuel pressure regulator is fully adjustable so regulating the fuel pressure to your engines needs is a simple task. All Holley regulators are pre-set at the factory so there is no guesswork when first installing the regulator. The Holley 12-704 fuel pressure regulator features 1/2" NPT in/out ports. *** 1 1/2 NPT to AN -8 and 2 1/2 NPT to AN -6 For AN style fittings included


  • Adjustable fuel regulation from 4-1/2 to 9 psi
  • One 1/2" NPT inlet and two 1/2" NPT outlet ports
  • .437" (7/16") restriction
  • Includes mounting hardware and an style fittings
  • Alcohol compatible


Emission Code3
Fuel SystemGasoline
Inlet Size1/2 inch NPT
Outlet Size1/2 inch NPT
Pressure Range4.5-9 PSI
Product TypeFuel Pump
Part Number12-704


This part is legal for use on Uncontrolled (Non-Emissions Controlled) Vehicles or Racing Vehicles.

The following vehicles are considered Uncontrolled (Non-Emissions Controlled) Vehicles:

  • 1965 and older U.S. manufactured California Certified vehicles
  • 1967 and older U.S. manufactured Federally Certified vehicles
  • 1967 and older Foreign manufactured vehicle

Racing Vehicles are vehicles that are used exclusively for racing or other forms of competition that are not registered and that may never be used on the street.

Tech Resources

*** 1 1/2" NPT to AN -8 and 2 1/2" NPT to AN -6 For AN style fittings included
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        Some parts are not legal for use in California or other states with similar regulations.