Best Holley Fuel Injection Pressure Regulators in 2026
Daisy
Last Updated: Jul 19, 2026
Daisy
Last Updated: Jul 19, 2026
* PickSmartly editors independently research, review, and endorse the top products through comprehensive data analysis. We may earn a commission for qualifying purchases made through our product links.
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Amazon.com | 9.68 | ✅ | ✅ | ✅ |
Allows removal of empty cylinder for refill without interrupting propane supply
For RVs with dual propane tanks; Automatically switches from primary to reserve tank when primary is empty
Pairs well with our 48 Inch Thermo Plastic Hose, item 100383-48.
Inlets are 1/4" SAE inverted flare and outlet is 3/8" NPT female pipe thread. Regulator is factory set at 11wc (water column)
Rated for 190, 000 BTU
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Amazon.com | 9.68 | ✅ | ✅ | ✅ |
Replacement fuel pressure regulator diaphragm repair kit
For Holley fuel pressure regulators
Includes diaphragm
Includes low and high pressure springs
Durable and long lasting
Fit type: Vehicle Specific
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Amazon.com | 9.68 | ✅ | ✅ | ✅ |
Carbureted Applications
Bypass Style
Adjustable 4.5-9PSI
3/8" NPT Ports
Used in systems with a return lineback to tank
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Amazon.com | 9.68 | ✅ | ✅ | ✅ |
Adjustable fuel regulation from 1 to 4 psi
.220" (7/32") restriction
3/8" NPT ports ( 1 in, 2 out)
Mounting bracket included
Pre-set at 2.8 PSI
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Amazon.com | 9.68 | ✅ | ✅ | ✅ |
Adjustable fuel regulation from 4-1/2 to 9 psi
Preset to 7psi
3/8” NPT ports (1 in, 1 out, 1 bypass or return)
Used in systems with a return line back to the fuel tank
Quieter fuel pump operation
Fit type: Vehicle Specific
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Advance Cycle Parts | 9.72 | ❌ | ❌ | ❌ |
Die Cast aluminum construction
3/8” NPT Inlet, Outlet, and Return ports
1/8” NPT Gauge Port
1/8" NPT Boost Reference – 1: 1
Durable and long lasting
Fit type: Vehicle Specific
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| JIS INC ✅ | 9.44 | ❌ | ❌ | ❌ |
Adjustable from 15-65 psi for precise fuel pressure adjustments
Constructed of billet aluminum with a black anodized base and clear anodize top for good looks
Used in systems with a return line back to tank
Includes fitting for manifold reference
Use with electric pumps only
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Parts Via | 9.46 | ❌ | ❌ | ❌ |
The package length is 9.652 centimeters
The package height is 6.604 centimeters
The package width is 9.144 centimeters
Package Weight : 0.2 pounds
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| BoostProjects | 9.80 | ❌ | ❌ | ❌ |
Adjustable from 4.5-9 psi for precise fuel pressure adjustments
Constructed of billet aluminum with a black anodized base and clear anodize top for good looks
Utilizes a idle bleed for precise control of idle pressure
Used in systems with a return line back to tank
One 3/8" NPT inlet, one 3/8" NPT outlet and one 3/8" NPT return (or bypass)
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Trends Auto | 9.83 | ❌ | ❌ | ❌ |
Brand New Holley Chrome Carbureted Fuel Pressure Regulator (Part #12-803)
Features: 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
Specs: Color: Shiny | Emission Code: 5 | Fuel System: Gasoline | Inlet Size: 3/8" NPT | Material: Aluminum | Outlet Size: 3/8" NPT | Pressure Range: 4.5-9 PSI | Product Type: Fuel Pump
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.
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Amazon.com | 9.68 | ✅ | ✅ | ✅ |
Adjustable from 15-65 psi for precise fuel pressure adjustments
Constructed of billet aluminum with a black anodized base and clear anodize top for good looks
Used in systems where a return line is not needed
Use with electric pumps only
Mounting bracket included
Fit type: Vehicle Specific
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| PARTSanytime | 9.39 | ❌ | ❌ | ❌ |
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Trends Auto | 9.83 | ❌ | ❌ | ❌ |
Adjustable from 35-65 psi
CNC machined billet aluminum
Clear anodized for good looks and corrosion protection
Bolts in stock location for ease of installation
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Amazon.com | 9.68 | ✅ | ✅ | ✅ |
Adjustable from 4.5-9 psi for precise fuel pressure adjustments
Constructed of billet aluminum with a black anodized base and clear anodize top for good looks
Used in systems where a return line is not needed
Use with electric or mechanical pumps
Mounting bracket included
Fit type: Vehicle Specific
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Trends Auto | 9.83 | ❌ | ❌ | ❌ |
Replacement fuel pressure regulator diaphragm
Fits 1bbl, 2bbl, and 4bbl Pro-Jection Throttle bodies
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Amazon.com | 9.68 | ✅ | ✅ | ✅ |
Black Anodized billet Construction
Universal design
Simplifies mounting Holley fuel pressure regulators
Included hardware for easy installation
Made in USA
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Southwest Speed ✅ | 9.63 | ❌ | ❌ | ❌ |
Brand New Holley Carbureted Bypass Fuel Pressure Regulator, Shiny Finish (Part #12-803BP)
Fits: Electric fuel pumps with a return line in the system | Features: Adjustable fuel regulation from 4.5 to 9 PSI | Preset to 7 PSI | 3/8" NPT ports (1 in, 1 out, 1 bypass or return) | Used in systems with a return line back to the fuel tank | Quieter fuel pump operation | Designed only for carburetor use | Polished finish | Mounting bracket included
Specs: Color: Shiny | Emission Code: 5 | Fuel Type: Gasoline | Inlet Size: 3/8" NPT | Material: Aluminum | Outlet Size: 3/8" NPT | Pressure Range: 4.5-9 PSI | Product Type: Fuel Pump
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 & 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 12-803BP fuel pressure regulator features 3/8" NPT in/out ports and a 3/8" NPT return port. | NOTE: The 803BP is designed for use with an electric fuel pump with a return line in the system. If you are using a mechanical fuel pump, use the 12-803 regulator.
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| Southwest Speed ✅ | 9.63 | ❌ | ❌ | ❌ |
Brand New Holley Die Cast EFI By Pass Style Fuel Pressure Regulator, Black, 60 PSI, 3/8" NPT Inlet, Outlet & Return Ports (Holley Part #12-886)
Holley does it again with their new die cast aluminum fuel pressure regulators. The same Holley quality that you expect at a price point that every budget can handle. 1/8" NPT barb fitting for boost reference port included.
Features: Die Cast aluminum construction | 3/8" NPT Inlet, Outlet & Return ports | 1/8" NPT Gauge Port | 1/8" NPT Boost Reference - 1:1
Specs: Application: Universal | Brand: Holley | Color: Black | Emission Code: 5 | Fuel System: EFI | Fuel Type: Diesel, Gasoline | Inlet Size: 3/8" NPT | Material: Aluminum | Outlet Size: 3/8" NPT | Pressure Range: 15-60 PSI | Product Type: Fuel Pressure Regulator | Return Size: 3/8" NPT
NOTE: Regulator is compatible with Diesel #1 & Diesel #2.
| SELLER | SELLER SCORE | AMAZON FULFILLED | PRIME | FREE SHIPPING |
|---|---|---|---|---|
| EZ Automotive | 9.26 | ❌ | ❌ | ❌ |
Fit type: Vehicle Specific
Made in China
Package Dimensions : 2.0 L x 8.0 H x 7.0 W (inches)
Package Weight : 0.8 pounds
Here is the list of top-rated brands that were evaluated by PM.
| Brand | Count |
|---|---|
| Holley | 14 |
| Southwest Speed | 3 |
| Flame King | 1 |
| Nitrous Express | 1 |
We've carried out a comprehensive analysis of 5,075 reviews on fuel injection pressure regulators holley, using our selection criteria to identify the best options in the automotive. Our findings reveal that most customers typically select fuel injection pressure regulators holley priced around $120.11, with top brands including flame king and holley and southwest speed
Our team of expert editors reviewed these high-quality items and handpicked the top 19 fuel injection pressure regulators holley for your consideration. We've also done extensive research on numerous sellers, identifying the best ones in the automotive category. These include amazon.com, advance cycle parts, jis inc ✅, trends auto, parts via, partsanytime and southwest speed ✅ and boostprojects .
We are dedicated to assisting our users in finding the right regulators Products based on their needs, saving them considerable time when choosing which fuel injection pressure regulators holley to buy. We take pride in the number of satisfied users we've helped through our thorough and insightful reviews.
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