HP Billet Carbureted Fuel Pressure Regulator

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

PART# 12-843

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Holley® Billet Fuel Pressure Regulators are part of a complete line of fuel system products from Holley®. They are precision machined from 6061-T6 billet aluminum for strength and durability. They feature a black bright dip anodized body and a clear bright dip anodized top for corrosion resistance and good looks. The Holley 12-843 fuel pressure regulator features (1) -10 AN O-ring inlet, (2) -8 AN O-ring outlets.


  • Adjustable from 4.5-9 psi for precise fuel pressure adjustments
  • Constructed of billet aluminum with a black anodized base and clear anodize top for good looks
  • Used in systems where a return line is not needed
  • Use with electric or mechanical pumps
  • (1) -10 an O-ring inlet,(2)-8 an O-ring outlets
  • 1/8" NPT gauge port
  • Comparable and interchangeable with popular Holley® 12-704 regulator
  • Mounting bracket included


ColorBlack Anodized
Emission Code3
Fuel SystemCarbureted
Fuel TypeGasoline / Diesel / E85
Outlet Size8 AN O-Ring
Pressure Range4.5-9 PSI
Product TypeRegulator
Part Number12-843


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.

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      Some parts are not legal for use in California or other states with similar regulations.