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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
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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
4.5 ★★★★★
Based on 11 reviews
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Product Reviews
★★★★★ 5
I Noticed Improved Digestive Results
I really liked these Migcopat fiber gummies. I started taking them after a gap from my last supplement and noticed a change. I felt a positive impact on my digestive results. My bowel movements were easier to pass, cleaner, and more well-formed. The pectin-based gummies were a little above average size, but they were soft and easy to chew. They did not stick to my teeth at all. They were sugar-free. They came in a clear plastic bottle. The gummies had a tasty, natural blueberry flavor. A serving size was two or three gummies, giving twenty or thirty servings per container. The formula included biotin, keratin, zinc, apple cider vinegar, and other vitamins. I was very happy with the taste, the texture, and the results. The Supplement Facts print was small on the container - it was a little larger on the box.
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Reviewed in the United States on May 23, 2026
★★★★★ 5
Great blueberry aroma, easy to chew, sugar-free formula, long expiration date
The blueberry aroma when I open the jar is wonderful, and the taste is excellent. I really like that the texture breaks down pretty easily when chewed instead of sticking to my teeth. It is great to find a sugar-free option that packs in fiber, prebiotics, and probiotics, plus a few extras like biotin and collagen. I have been taking supplements like this for years, so I do not expect to feel any drastic changes, but everything is working well for me with no ill effects. It is also nice that the expiration date is clearly printed on both the box and the bottle, giving my batch about 23 months of shelf life.
Pros
✅ Excellent blueberry taste and aroma.
✅ Soft texture breaks down easily without sticking to teeth.
✅ Sugar-free formula with a great 23-month expiration window.
✅ Includes hair and skin support ingredients like biotin and collagen.
Neutrals
– The 60-count bottle yields 20 to 30 servings depending on whether you take two or three gummies.
Cons
❌ None observed, these are very pleasant to take.
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Reviewed in the United States on May 12, 2026
★★★★★ 5
Tasty, Easy to Take
This is the 3rd flavor of this brand that I've tried. I have to say that I preferred the grape and the little strawberry hearts better than these, as far as taste. These also are quite high in Biotin at 33,333% of the daily value, if you take the 3 gummies that equal 10g fiber. If you do want 10g of fiber the jar won't last an entire month. I don't really need the hair/nail support, so I'll probably go back to one of the other flavors. These are so easy to get out of the wide-mouth jar and they don't stick together too much. They're a soft gummy and are easy to chew. I don't tend to have an issue with them sticking to my teeth. The jar I received was manufactured in Apr 2026 and expires Apr 2028. Another reviewer mentioned that they're made in the USA, but I don't see that claim anywhere in the listing or on the product...although they're distributed by a New York company.
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Reviewed in the United States on May 13, 2026
★★★★★ 4
Fewer doses per jar, but good flavor
I've been using migcopat fiber gummies for a while now, and I'm a fan of the brand, so I thought I would give these a shot.
I appreciate the addition of the biotin and keratin.
This just only has one flavor instead of three, which is blueberry, but it's quite pleasant, not overly sweet. These gummies are a little softer than the other migcopat gummies, but again nothing wrong with that.
I am knocking one star from the review because this jerk contains 20 doses when you take three per day as opposed to the other maker gummies that I have where there's a 30-day supply with taking three per day.
For me, the addition of the biotin and keratin doesn't justify losing a third of my supplement.
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Reviewed in the United States on May 21, 2026
★★★★★ 5
Great value
This is 1 of those items that would take months to give a fair assessment. It takes time for things like this to get into your system. This was a vine item and I wanted to try them as fiber is very important after 50. But I can not speak to the effectiveness. I hope and expect there would be no side effects. Texture seems normal for something like this. Not sure if theres a odor. But seems a good value. Not sure about taste either.
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Reviewed in the United States on June 1, 2026