Holley Billet Fuel Pressure RegulatorHolley Billet Fuel Pressure Regulator

Holley Billet Fuel Pressure Regulator


Holley Billet Fuel Pressure Regulator,

Street/Strip Carbureted Applications Two Port Adjustable from 4.5 to 9 PSI 3/8 NPT

Available on backorder

SKU: 6656 Category: Brand:


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 12-840 fuel pressure regulator features 3/8″ NPT in/out ports.

  • 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
  • One 3/8″ NPT inlet and two 3/8″ NPT outlets
  • 1/8″ NPT gauge port
  • Comparable and interchangeable with popular Holley® 12-803 regulator
  • Mounting bracket included

Additional information

Weight 2 lbs
Dimensions 6 × 5 × 5 in



weight 0.68
length 2.5
width 3.5
height 3.5
Brand Holley
Color Black Anodized
Emission Code 5
Fuel System Carbureted
Fuel Type Gasoline / Diesel / E85
Inlet Size 3/8 inch NPT
Material Aluminum
Outlet Size 3/8 inch NPT
Pressure Range 4.5-9 PSI
Product Type Regulator
Style Non-Return
Warning California Proposition 65
Warranty Limited 90 Day


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