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Holley 12-804

Standard Fuel Pressure Regulator 3/8" NPT Inlet/Outlet

Holley 12-804

Part Number: 510-12-804

Standard Pressure Regulator
  • Chrome Finish
  • For use with gasoline
  • Port Size: 3/8" NPT Inlet/Outlet
  • 1 to 4 PSI
  • Includes Mounting Bracket
  • $29.67
    Holley 12-804 Standard Fuel Pressure Regulator 3/8" NPT Inlet/Outlet $29.67

    Holley 12-804 Details

    Standard Pressure Regulator

  • .220 in. Restriction
  • Low Pressure 1-4 PSI
  • High Pressure 4.5-9 PSI
  • Not Alcohol Compatible

  • Specifications:

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

    These Holley Fuel Pressure Regulators are great for adjusting for fuel pressure requirements of various carburetors. Having too much fuel pressure present at the inlet of the carburetor will cause the needle and seat to stay open resulting in flooding and driveability issues.

    Holley Standard Pressure Regulator
    Recommended for low-pressure applications that require steady flow. Fuel pressure regulators are factory adjusted by Holley to 2.7 psi with a 1-4 psi range. Accepts 3/8" NPT fittings.

    Holley Max Pressure Regulator
    Adjusts from 4.5 to 9 psi. Also good as a high-pressure bypass. 2 regulators are recommended for dual 4-barrel applications. Accepts 3/8" NPT fittings.

    Holley Big-Port Regulator
    Die-cast aluminum regulator adjusts from 4.5 to 9 psi. Least restrictive, highest flowing production regulator with one 1/2" NPT inlet port and two 1/2" NPT outlet ports. Mounting hardware included.

    Rated 5 out of 5 by from Great low pressure regulator Purchased this several weeks ago and has made the best performance gains. Consistent even fuel pressure, gives great control. Only thing I would do is add a permanent fuel pressure gauge into the system to make adjustments easier. Trying to run the motor and make pressure changes with a general fuel pressure gauge is a little awkward but not terrible. I will look to holley in the future when I need fuel pressure control.
    Date published: 2015-10-10
    Rated 5 out of 5 by from Great features easily installed Product arrived on time. The product was easily installed. And was exactly four PSI as stated. But one of the greatest things is a rebuild kit is available through Jegs.
    Date published: 2016-10-21
    Rated 4 out of 5 by from A good value Does what it's supposed to for a low price. Don't forget that you'll need the brass fittings as well as they are not included. This is the second one I've purchased in the 1-4 PSI range as I am finding that my carburated vehicles are very sensitive to ethanol laced fuel.
    Date published: 2015-09-20
    Rated 1 out of 5 by from Does Not work as it should Output pressure goes up to input pressure. .my input pressure was 7 lbs ...Very disappointed in Holley..I thought I was getting quality, that is why I didn't buy an off brand product...
    Date published: 2015-02-14
    Rated 5 out of 5 by from Problem solved. The regulator solved the problem of flooded fuel bowels on my converted 4160 to 4150 390CFM 8007 Holley. On a well built 310 c.i. Ford in a 72 Bronco.
    Date published: 2014-11-02
    Rated 5 out of 5 by from Easy install We bought this product for our 1986 Jeep CJ and it installed very easy and we are anxious to have it on the road again :)
    Date published: 2014-12-29
    Rated 5 out of 5 by from Problem solved Best regulator for the Jeep Weber carb conversion. Accurate and hols pressure. Used the second port for a pressure gauge.
    Date published: 2016-05-18
    Rated 5 out of 5 by from Great shopping experience Wow, I ordered my parts and fast professional service. Love doing business with vendors like this!!
    Date published: 2015-02-15
    • 2016-10-25T08:31CST
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