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Holley 12-841

Billet Adjustable Regulator

Holley 12-841


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Holley 12-841 Billet Adjustable Regulator $99.78
Billet Adjustable Regulator
  • Carbureted Applications
  • Bypass Style
  • Adjustable 4.5-9PSI
  • 3/8" NPT Ports

  • Holley 12-841 Details

    HP Series Regulators

  • Used in systems with a return line back to tank
  • Use with electric pumps only
  • Adjustable from 4.5-9 PSI for precise fuel pressure adjustments
  • One inlet, one outlet, one return (or bypass)

  • Specifications:

    Mounting Bracket Included
    Fittings Included
    Boost/Vacuum Reference Port
    Gauge Port
    Inlet Attachment
    Female Threads
    Outlet Attachment
    Female Threads
    Pressure Range (psi)
    Sold individually
    Regulator Finish
    Black/Clear anodized
    Regulator Location
    Regulator Material
    Billet aluminum
    Regulator Style
    Return Attachment
    Female Threads
    Return Fitting Size (in.)
    3/8 NPT
    Inlet Size (in.)
    3/8 NPT
    Outlet Size (in.)
    3/8 NPT
    Outlet Quantity
    Inlet Quantity
    Manufacturer's Part Number:

    Holley Billet Fuel Pressure Regulators are part of a complete line of fuel system products. 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. Holley Billet Fuel Pressure Regulators are available in a variety of configurations.

    HP & Dominator Series
  • Demand and return style regulators available.
  • CNC machined from 6061-T6 billet aluminum for strength.
  • Black bright dip anodized body and a clear bright dip anodized top for corrosion resistance and good looks.
  • All regulators feature a 1/8" NPT gauge port.
  • Carbureted and EFI versions available.
  • All regulators include a mounting bracket for easy installation.

    Ultra HP & VR Series
  • Can support 3,000+ HP engine applications that require high flow fuel volumes.
  • EFI regulators are adjustable from 40-100 PSI base pressure.
  • Carbureted regulators are adjustable from 4 to 9 PSI base pressure.
  • Compatible with gasoline, methanol, and E85* (*requires draining and flushing after each race).
  • 1/8" NPT gauge port.
  • Designed for use with the Holley Ultra HP and Ultra Dominator Brushless in-line fuel pumps.
  • Can be referenced on a 1:1 ratio - includes a barb fitting and a -4 AN fitting for reference connection.
  • 2 port regulators feature a 10 AN O-ring inlet/outlet and return.
  • 4 port regulators feature a 10 AN O-ring inlet and return with (4) 8 AN O-ring outlets.

  • 12-841 - Holley Billet Fuel Pressure Regulators is rated 4.4 out of 5 by 5.
    Rated 5 out of 5 by from great part Fixed all my problems, hot rod runs great now. Part came fast.
    Date published: 2017-05-16
    Rated 5 out of 5 by from Looks and Works Great... Working Great so far. Easy to install...Billet looks real good
    Date published: 2015-06-22
    Rated 5 out of 5 by from Works great! Bought this bypass regulator for a V8 S10 so I can use the factory in tank fuel pump. Add a JEGS fuel pressure gauge any you're set. Deadhead style regulators are a lot cheaper but you will burn out your fuel pump. Spend the extra cash now and save some frustration later.
    Date published: 2014-11-01
    Rated 4 out of 5 by from Installation was a breeze I installed it on a work in progress so I haven’t actually ran it yet but so far i am very satisfied.
    Date published: 2018-01-19
    Rated 3 out of 5 by from Works good looks good. I used mine for a tbi to carb conversion using the stock in tank electric fuel pump as recommended by holley and I'm satisfied with it so far...
    Date published: 2014-11-02
    • y_2018, m_4, d_20, h_24
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    Will this work with the Holley Mighty Mite fuel pumps 

    Asked by: Cannon23
    This regulator could be used with the Mighty Mite pump line.
    Answered by: Jon Jegs Tech
    Date published: 2017-12-05
    • y_2018, m_4, d_20, h_24CST
    • bvseo_bulk, prod_bvqa, vn_bulk_2.0.8
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    Items You Need
    Some parts are not legal for use in California or other states with similar laws / regulations