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Holley 12-803

Holley Carbureted Fuel Pressure Regulator


$50 off $500, $75 off $750, $100 off $1000. Enter Promotion Code: TAX1040

Holley Carbureted Fuel Pressure Regulator $32.08
Out of stock
Carbureted Fuel Pressure Regulator
  • For Use With Gasoline
  • Inlet: (1) 3/8" NPT
  • Outlet: (2) 3/8" NPT
  • 4-1/2 to 9 psi
  • Includes Mounting Bracket
  • Cast Aluminum
  • Chrome Finish
  • Holley 12-803 Details

    Carbureted Fuel Pressure Regulators

    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.

  • 3/8 in. NPT Ports
  • .220 in. Restriction
  • Incl. Mounting Bracket
  • Low Pressure 1-4 PSI
  • High Pressure 4.5-9 PSI
  • Chrome Finish
  • Not Alcohol Compatible

  • 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
    Chrome plated
    Regulator Location
    Regulator Material
    Regulator Style
    Inlet Size (in.)
    3/8 NPT
    Outlet Size (in.)
    3/8 NPT
    Outlet Quantity
    Inlet Quantity
    Manufacturer's Part Number:

    Holley Die Cast Fuel Pressure Regulators are designed to precisely control the fuel pressure from the fuel pump to the fuel distribution system. Each Holley fuel pressure regulator is fully adjustable and regulating the fuel pressure to your engines specific needs is easy. All Holley regulators are pre-set at the factory so there is no guesswork when first installing the regulator. Pumps are available in a veriety of pressure ranges for both EFI and carbureted applications.

    JEGS Easy Kits are designed by JEGS high performance racing professionals to help you get all the performance parts you need for your race car, hot rod or truck.

    12-803 is rated 4.8 out of 5 by 12.
    Rated 5 out of 5 by from Another great Holley product Very accurate dependable regulator. Bought this one to replace the first one I bought about 20 Years ago. Thanks
    Date published: 2017-12-24
    Rated 5 out of 5 by from Just what it should be. I've got a mean 1938 Chevy that was put together about 45 years ago. The electric fuel pump went bad a while back and I replaced it with a Jeg's pump which had too much pressure for the 800 Holley double-pumper. I wanted to keep the car as close as possible to the original look and build and didn't want a regulator and gauge showing. The Holley regulator said it was preset so I mounted it under the car on the frame and didn't use a gauge. The pressure setting from the factory works fine and I didn't have to stick a gauge anywhere,
    Date published: 2017-06-08
    Rated 5 out of 5 by from Product is easy to use and holds up well Installed on my RV and is easy to adjust and doing well. You can also rebuild it.
    Date published: 2016-12-04
    Rated 5 out of 5 by from Holley Regulator Very Satified!!!!!!!!!!!!!!! Would buyu this product again!
    Date published: 2016-10-04
    Rated 5 out of 5 by from Great Regulator for the money Awesome regulator for carburated nitrous set up. Have 3 regulators, one for each stage of nitrous. Rock steady and reliable. Best for the money.
    Date published: 2016-05-31
    Rated 5 out of 5 by from Holley regulator Been doing a lot of business with Jegs as of recent and will continue. Their prices are reasonable and the products are great. Thank you for being there for us gearheads
    Date published: 2016-05-16
    Rated 5 out of 5 by from High Quality! This regulator may be inexpensive, but it is definitely not cheap. The whole assembly is solid and well constructed. Adjustments are very easy to make if the preset pressure is not preferred, and the pressure is maintained accurately regardless of temperature. Be sure to attach the mounting bracket to the regulator before attaching the inlet fuel line!
    Date published: 2016-05-03
    Rated 5 out of 5 by from High Quality I bought this for my Edelbrock AFB and it works great
    Date published: 2016-01-19
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    Can I use this regulator with a efi fuel pump thats rated at 60psi for feeding a 750cfm carb? Will I need a return line since I’m going from 60psi to around 6-7psi? Does this regulator have a “out” return outlet to get un-used fuel back to the tank?

    Asked by: Logicalloco
    No, you will need an EFI regulator like this - https://www.jegs.com/i/Aeromotive/027/13220/10002/-1
    Answered by: Rusty B
    Date published: 2018-09-25
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