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#42712803
Holley 12-803 Fuel Pressure Regulator, 2-Port, 4.5-9 PSI
- .220" (7/32") restriction
- Regulator features 3/8" NPT in/out ports
- Fuel pump regulator works well with Holley high performance fuel pumps
$46.07
/each
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$51.19
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Product Summary
Universal Fit, 4.5-9 Fuel Pressure Rating (psi), Steel
- .220" (7/32") restriction
- Regulator features 3/8" NPT in/out ports
- Fuel pump regulator works well with Holley high performance fuel pumps
- Flash chromed steel
- All Holley regulators are pre-set at the factory so there is no guesswork when first installing the regulator
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Return PolicyHolley 12-803 Details
Holley 12-803 Details
Holley fuel pressure regulators are designed to precisely control the fuel pressure from the fuel pump to the carburetor. Too much fuel pressure for a given needle and seat assembly can overload the needle and seat and may cause flooding or drivability problems. Each Holley fuel pressure regulator is fully adjustable so regulating the fuel pressure to your engines needs is a simple task. All Holley regulators are pre-set at the factory so there is no guesswork when first installing the regulator. The Holley 12-803 fuel pressure regulator features 3/8" NPT in/out ports.
- Adjustable fuel regulation from 4-1/2 to 9 psi
- .220" (7/32") restriction
- 3/8" NPT ports ( 1 in, 2 out)
- Chrome finish
- Mounting bracket included
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Save 10% instantly on select products across the Holley family of performance brands during the annual Holley I.R.S.Tax Sale. Instant rebate period runs from February 17, 2026 through March 29, 2026.
Guides & Documents
Holley 12-803 Specifications
Holley 12-803 Specifications
| KEY SPECS | |
|---|---|
| MFG. Part # | 12-803 |
| Brand | Holley |
| Regulator Style | Non-return |
| Material Type | Steel |
| GENERAL | |
| Fuel Pressure Rating (psi) | 4.5-9 |
| Pressure Regulator Inlet Size | 3/8" NPT |
| Pressure Regulator Outlet Size | 3/8" NPT |
| Inlet Quantity | 1 |
| Outlet Quantity | 2 |
| Mounting Hardware Included | Yes |
| Includes Mounting Bracket(s) | Yes |
| Fittings Included | No |
| Sold in Quantity | Each |
| GTIN Code | 090127020227 |
Ratings & Reviews
4.8
18 Reviews
Customers highly rate our product for its reliable performance, ease of use, and excellent quality. It effectively regulates fuel pump pressure, holding it precisely at 6 PSI regardless of temperature. The sturdy, high-quality design fits well with various setups and adjustments are simple. Users recommend it especially when switching to a carburetor or breaking in a new engine. Despite being a robust and efficient solution to fuel pressure problems, the product is priced reasonably. Some users found that additional steps like getting threads tapped were required, but overall satisfaction with the product performance is high.
Ratings & Reviews
4.8
18 Reviews
Customers highly rate our product for its reliable performance, ease of use, and excellent quality. It effectively regulates fuel pump pressure, holding it precisely at 6 PSI regardless of temperature. The sturdy, high-quality design fits well with various setups and adjustments are simple. Users recommend it especially when switching to a carburetor or breaking in a new engine. Despite being a robust and efficient solution to fuel pressure problems, the product is priced reasonably. Some users found that additional steps like getting threads tapped were required, but overall satisfaction with the product performance is high.
4.8
18 reviews
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15
4
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Most Liked Positive Review
4.0
No problem with the product
Once opened the box and reading the instructions it said that the regular is not to be used with mechanical fuel pumps which I have. I did not see this info on the online details of this regular when I ordered it. I ordered it due to the Edelbrock carb requires 6 psi or less
Most Liked Negative Review
3.0
Maybe
Need to get the threads tapped to use it
Filter by Ratings
I would buy from them again but don't need to.
5.0
a month ago
Bill N.
Las Vegas, NV
Verified
It did what it's supposed to and had the correct fuel pressure rating
Would Recommend
Does the job, but will leak due to new fuels over time
4.0
2 months ago
RM
California
Verified
Like the title says, this will do the job, just be prepared to buy a new diaphragm after a year or so. Today's fuels wreak havoc on the gasket material.
Would Recommend
Nicer looking piece than I expected
5.0
a year ago
RS
Box Elder SD
Verified
This is a quality regulator. Nice shiney piece for the engine compartment.
Would Recommend
Great product
5.0
a year ago
None
Lancaster, KS
Verified
This part was installed on a 1947 Ford Ratrod. It has a 421 sbc in it with tunnel ram and 2 450 Holley carbs.
Would Recommend
Great product. Nice fit and finish.
5.0
2 years ago
Allen S
Wadena MN
Verified
Used it because the new fuel pump was putting out 15lbs. Worked great.
Would Recommend
No problem with the product
4.0
3 years ago
Anthony
Santa Maria CA.
Verified
Once opened the box and reading the instructions it said that the regular is not to be used with mechanical fuel pumps which I have. I did not see this info on the online details of this regular when I ordered it. I ordered it due to the Edelbrock carb requires 6 psi or less
Would Recommend
Meets both Holle0y and Speedway's high standards
5.0
4 years ago
Drifter
Virginia beach
Verified
Holds pressure precisely at 6 PSI recommended by Edelbrock no fluctuation hot or cold that was exactly what I had hoped
Would Recommend
I would buy this again as it did it's job.
5.0
4 years ago
Ken
Cokato, MN
Verified
I needed to cut my gasoline pressure from electric fuel pump and this product worked perfectly.
Would Recommend
Regulators
5.0
4 years ago
Rickter
Lakewood Colorado
Verified
Easy to and adjust when used with gauge
Would Recommend
Yes
5.0
5 years ago
DJ
Lake Charles, Louisiana
Verified
Fits well with speedway gauge, no leaks, preset @6psi.
Would Recommend
Showing 10 of 18 reviews