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Description
Holley Billet Fuel Adjustable Regulator Carbureted 4.5-9PSI # HO12-845Holley Billet Fuel Adjustable Regulator Carbureted 4. 5 9PSI # HO12 845 Fuel Pressure Regulators, HP Billet, 4. 5 to 9 psi, Inline, Return Style, 8 AN Inlet and Outlet, 6 AN Return, Black Finish, Bracket, Each Regulator Pressure (psi): 4. 5 9 Regulator Style: Return Regulator Location: Inline Boost Vacuum Reference Port: No Gauge Port: Yes Inlet Quantity: 1 Regulator Inlet Size: 8 AN Inlet Attachment: Female straight cut O ring Outlet Quantity: 1
Holley Billet Fuel Adjustable Regulator Carbureted 4.5-9PSI # HO12-845Fuel Pressure Regulators, HP Billet, 4.5 to 9 psi, Inline, Return Style, -8 AN Inlet and Outlet, -6 AN Return, Black Finish, Bracket, Each
Regulator Pressure (psi):
4.5-9
Regulator Style:
Return
Regulator Location:
Inline
Boost/Vacuum Reference Port:
No
Gauge Port:
Yes
Inlet Quantity:
1
Regulator Inlet Size:
-8 AN
Inlet Attachment:
Female straight cut O-ring
Outlet Quantity:
1
Regulator Outlet Size:
-8 AN
Outlet Attachment:
Female straight cut O-ring
Return Fitting Size:
-6 AN
Return Attachment:
Female straight cut O-ring
Fittings Included:
No
Regulator Material:
Aluminum
Regulator Color:
Black
Rebuildable:
No
Mounting Bracket Included:
Yes
Remanufactured:
No
Quantity:
Sold individually.
Notes:
This regulator is designed for use with Holley HP in-line or other high pressure fuel pumps where a return line is required.
Holley HP Billet Fuel Pressure Regulators
Part of Holley's complete line of fuel system products, Holley HP billet fuel pressure regulators are available in a variety of configurations for carbureted or fuel injected engines. Some versions are even adaptable to either carburetors or EFI. They allow you to upgrade a carbureted system to EFI without replacing the fuel pressure regulator.All HP billet fuel pressure regulators feature a 2-port design, provide for precise fuel pressure adjustments, and are available in your choice of demand (no return line) or by-pass (with a return line) styles. Depending on the model, they are for use only with electric fuel pumps, or with either mechanical or electric pumps. Designed for street/strip applications, they are CNC-machined from 6061 T-6 billet aluminum for strength and have bright dip anodized black bodies with clear dip anodized tops for corrosion resistance and good looks. Whatever your fuel system needs, Holley has you covered.Depending on model, features may include: Adjustable from 4 to 65 psi for use with EFI or carburetors 4.5 to 9 psi adjustment range for use with carburetors only EFI-only models are adjustable from 15 to 65 psi Two port sizes available, 3/8 in. NPT or -6 AN inlet/outlet and return (where applicable) Fitting for manifold reference 1/8 in. NPT gauge port Boost reference--1:1
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
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Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
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Product Reviews
★★★★★ 5
deeply insightful
Format: Hardcover
A deeply insightful and comforting book that helped me better understand unhealthy relationship patterns. The author explains complex emotional topics in a very relatable way. I couldn’t put it down.
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Reviewed in the United States on May 19, 2026
★★★★★ 5
pretty cover but a little damaged please handle with care when delivering
but come a bit damaged..please deliver properly
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Reviewed in Singapore on 10 April 2026
★★★★★ 5
Good Condition
Format: Paperback
Book came in well package and good conditions. On time
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Reviewed in Singapore on 4 July 2024
★★★★★ 5
Better than canned air
I got this because I got sick or buying canned air. This will pay for itself in a short time if you use canned air often enough. Surprisingly powerful and can even blow some debris from the floor of my garage from a standing position. Different attachments for whatever your need it. Well worth it. As soon as I got it I cleaned all my electronics and was satisfied by how much dust flew out of them. Electronics can now breath again and are performing as they should and are not overheating.
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Reviewed in the United States on April 24, 2026
★★★★★ 5
Best portable air dusters on the market - extremely powerful and lightweight! 🙏🏻
As someone who cuts hair, this Wolfbox MF50 has been super useful for keeping my clippers, trimmers, and my station clean.
This is one of my favorite products I have in my kit and overall it’s one of the best investments I’ve made.
The airflow is strong enough to blow hair out of blades and hard-to-reach areas without needing an air compressor and on the go.
It’s compact, rechargeable, and easy to keep at the barber station.
Great tool for barbers or anyone who wants quick cleanup during cuts.
The battery takes a while to recharge but if you plug it in after every use you should have no problems using it all day.
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Reviewed in the United States on May 26, 2026
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