HP Billet Carbureted By-Pass Fuel Pressure Regulator

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

PART# 12-845

Suggested Retail: $175.95
Your Price: $157.95
Free Shipping on orders over $100*


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 12-845 fuel pressure regulator features (1) -8 AN O-ring inlet, (1) -8 AN O-ring outlet, (1) -6 AN O-ring return.


ColorBlack Anodized
Emission Code3
Fuel SystemCarbureted
Fuel TypeGasoline / Diesel / E85
Inlet Size8 AN O-Ring
Outlet Size8 AN O-Ring
Pressure Range4.5-9 PSI
Product TypeRegulator
Return Size6 AN O-Ring
WarningCalifornia Proposition 65

Tech Resources


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.

WARNING FOR 12-845: This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.
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    *Free Shipping & Handling only offered to the continental US on orders over $100.

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