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#42712804
Holley 12-804 Adjustable Fuel Pressure Regulator, 1-4 PSI
- Designed to be used with standard pump only
- Measures 2-1/2" wide and 1-1/2" tall and deep
- 3/8" NPT Inlet/Outlets
$51.95
/each
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Product Summary
Universal Fit, 1-4 Fuel Pressure Rating (psi), Aluminum
- Designed to be used with standard pump only
- Measures 2-1/2" wide and 1-1/2" tall and deep
- 3/8" NPT Inlet/Outlets
- This low pressure fuel regulator is factory-set to 2.7 PSI, but is fully adjustable from 1 to 4 PSI
- It includes mounting bracket with 2 each self-tapping screws for regulator to bracket installation purposes and 3 screws for bracket to vehicle installation
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Holley 12-804 Details
This Holley universal low pressure fuel regulator is factory-set to 2.7 PSI, but is fully adjustable from 1 to 4 PSI. Use with standard pump only - not recommended for maximum pressure pumps. Fuel pressure regulator includes mounting bracket with 2 each self-tapping screws for regulator to bracket installation purposes and 3 screws for bracket to vehicle installation.
Regulator has a 3/8" NPT tapped fuel pressure gauge port and requires reducer 617-6157 to install the gauge. Fuel pump regulator has 3/8" NPT inlet/outlet ports.
Bracket Measurements:
- 2-1/2" wide
- 1-1/2" tall and deep
- 1-3/4" hole spacing to mount the regulator to the bracket
- Chrome steel construction
Charts
427-12804 Instructions (PDF)
Guides & Documents
Holley 12-804 Specifications
Holley 12-804 Specifications
| KEY SPECS | |
|---|---|
| MFG. Part # | 12-804 |
| Brand | Holley |
| Regulator Style | Return |
| Material Type | Aluminum |
| GENERAL | |
| Fuel Pressure Rating (psi) | 1-4 |
| Pressure Regulator Inlet Size | 3/8" NPT |
| Pressure Regulator Outlet Size | 3/8" NPT |
| Sold in Quantity | Each |
| Notes | This part is flash chromed. |
| Overall Height | 1.91" |
| GTIN Code | 090127020234 |
Ratings & Reviews
4.6
41 Reviews
Customers commend this product for its high quality performance and practicality. They noticed an improvement in their car performance after replacing older and defective regulators with this one. Many found it to be the perfect solution for their vehicles, especially for certain models like the Stromberg's 97, Datsun 240z with dual SU carburetors, and others. Some experienced ease of installation and adjustments. A few customers reported pressure spikes that required a bypass creation, and one customer criticized the product for its offshore manufacturing and design. Regardless, overall, buyers considered this product to be reliable and effective.
Ratings & Reviews
4.6
41 Reviews
Customers commend this product for its high quality performance and practicality. They noticed an improvement in their car performance after replacing older and defective regulators with this one. Many found it to be the perfect solution for their vehicles, especially for certain models like the Stromberg's 97, Datsun 240z with dual SU carburetors, and others. Some experienced ease of installation and adjustments. A few customers reported pressure spikes that required a bypass creation, and one customer criticized the product for its offshore manufacturing and design. Regardless, overall, buyers considered this product to be reliable and effective.
4.6
41 reviews
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31
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Most Liked Positive Review
5.0
Just what I needed!
I struggled with the carb on my old Willys jeep pickup for a year after I replaced all the old stuff. It made no sense, was running before I replaced everything, would not run afterwards--until I put on the simple, easy-to-install (did I mention chrome?) regulator. Now she's ready for the parades again!
Most Liked Negative Review
1.0
Don't buy it!
Very poor design and quality. The "Flash Chrome" has the appearance that it won't hold up over time. The way it attaches to the bracket was poorly thought out. Had to grind down one of the screw heads to get to clear the fitting. The attach screws are "self tapping"? The inlet/outlet threads are very rough and difficult to get to stop leaking. The instructions that come with it mainly cover installing a fuel pump, not a regulator. The regulator was supposed to be set for 2.7 psi but was actually set at 6.2 psi. It's made offshore and it shows. Do yourself a favor and keep looking.
Filter by Ratings
Too much fuel pressure
5.0
a year ago
Cud
Backwoods, Michigan
Verified
Stock 327 fuel pump was flooding my two barrel carb with over 10psi. Works much better now under 4 psi.
Would Recommend
Exactly what was needed, quickly delivered.
5.0
2 years ago
Goatgas
Venice Fl.
Verified
Used in my MG race car
Would Recommend
Great stuff!
5.0
2 years ago
The Lemming
Spokane
Verified
Top Line product for monitoring the fuel pressures!
Would Recommend
Good product
4.0
3 years ago
Bill 40
Salem Oregon
Verified
Sent back.
Would Recommend
I will buy again
5.0
3 years ago
hotrod
ohio
Verified
use with 97 Stromberg's works great
Would Recommend
Exactly what I needed
5.0
4 years ago
George
Austin, TX
Verified
Replaced a different Holley pressure regulator that did not restrict the flow to what I needed. This one dropped in and works great.
Would Recommend
I have always been happily satisfied with the parts I've rec
5.0
4 years ago
Choir Boy 50
Nor Cal
Verified
Shipped quickly
Would Recommend
I would buy this again
5.0
5 years ago
Evilrado 402
Lincoln ne
Verified
This is a dead head style i had to build in a bypass or pressure would spike
Would Recommend
Fuel Pressure Regulator
5.0
5 years ago
Chuck E
San Jose, CA
Verified
Nice compact unit. The 3/8 inch pipe fittings are oddball and the "T" configuration is a little weird, but it works well.
Would Recommend
Haven't installed it yet, seems to be exactly what I need
5.0
5 years ago
Steve
Sterling Colorado
Verified
My old Mr. Gasket regulator got to where I didn't trust it any more, so I did some research and decided this Holly sounded like the best one for not a whole lot of money. I'm setting up dual Strombergs on a rebuilt flathead, so I liked the idea of two ports on the regulator instead of using a fuel block.
Would Recommend
Showing 10 of 41 reviews
Questions & Answers
Questions & Answers
10 Questions • 18 Answers
what is this regulator pressure factory setting and how can it be adjusted without a pressure gauge? thanks,
by bubba
• 5 years ago
1 answer
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Do you need a return line back to the tank, or can you reduce the pressure without a return line.
by Kip
• 7 years ago
3 answers
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Can this be reduced foe 1/4 inch lines and still work properly? Old BobCat skid steer 2-3 psi max.
by Craig
• 9 years ago
3 answers
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I guess I may not understand why this regulator has a 3rd hole in bottom. I thought I hook up a inlet and a out line. ??? Please help. Thanks, Don
by Don
• 9 years ago
3 answers
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will this regulator work ok with a generic electric pump?
by dan
• 9 years ago
3 answers
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Will this regulator work with standard pump gas that has 10% or 15% ethanol?
by Jim
• 9 years ago
1 answer
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Do you recommend a specific pressure gauge to work with this setup?
by Danny
• 11 years ago
1 answer
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can this be used with a holley mechanical fuel pump producing 8 p.s.I. pressure
by streetrodman
• 11 years ago
1 answer
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does this regulator come with fittings for 5/16 fuel line?
by banksy
• 12 years ago
1 answer
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Does the bracket come with this regulator to attach to firewall?
by 40MercFlathead
• 14 years ago
1 answer
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