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- Holley 12-704 Carbureted Fuel Pressure Regula...
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Item #:
39699901
Holley 12-704 Carbureted Fuel Pressure Regulator
87% of respondents would recommend this to a friend
Item #:
39699901
SLE 5788
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Order now and get it around Saturday, September 26
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Each Holley fuel pressure regulator is fully adjustable so regulating the fuel pressure to your engine's needs is a simple task.
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What Stands Out
Precision Control
Ensures consistent fuel pressure regulation for optimal engine performance, reducing the risk of engine flooding or lean conditions.
Durable Construction
Built with high-quality materials that withstand harsh environments, providing long-lasting reliability for automotive enthusiasts.
Easy Installation
Designed for straightforward installation, allowing users to upgrade without complicated modifications for improved fuel management.
Product Details
| Fit Type | Vehicle Specific Fit |
| Compatible with Vehicle Type | Car |
| Auto Part Position | Rear |
| Outlet Connection Type | 1/2 NPT |
| Inlet Connection Type | Threaded |
| Gas Type | Gasoline |
| Mounting Type | Tank Mount |
| Operation Mode | ON-OFF |
| Product Grade | New |
| Automotive Fit Type | Vehicle Specific Fit |
| OEM Equivalent Part Number | 12-704 |
| Connector Type | NPT |
| Material Type | Plastic |
| Body Material | Plastic |
| Specification Met | Energy Rating |
| Product Style | Traditional |
| Item Dimensions | 5.5 x 5.3 x 3.15 inches (14 x 13.5 x 8 cm) |
| Item Weight | 1.1 pounds (500 grams) |
| Outlet Connection Size | 0.5 inches (1.3 cm) |
| Inlet Connection Size | 0.5 inches (1.3 cm) |
| Brand Name | Holley |
| Manufacturer Part Number | 12-704 |
| Global Trade Identification Number | 00090127116128 |
| Unit Count | 1 Count |
| Manufacturer | Holley |
| UPC | 090127116128 |
| Included Components | Holley 12-704 Carbureted Fuel Pressure Regulator |
| Item Type Name | Holley 12-704 Carbureted Fuel Pressure Regulator |
| Model Number | 12-704 |
| Brand | Holley |
| Vehicle Service Type | Car |
| Item dimensions L x W x H | 5.5 x 5.3 x 3.15 inches (14 x 13.5 x 8 cm) |
| Material | Plastic |
Dangerous Goods
To avoid the delay in customs clearance process for Dangerous Goods, the shipment shall be opened at our warehouse facility to check the severity of hazardous components. Please see the list of Dangerous goods here.
Who Should Buy?
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Car Enthusiasts
Ideal for those who modify their vehicles and need precise fuel pressure management for optimal performance.
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Street Rod Builders
Beneficial for builders creating custom street rods that require reliable fuel delivery for increased horsepower.
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Off-Road Users
Great for off-road applications where consistent fuel pressure is crucial for performance in challenging conditions.
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Casual Drivers
Not suitable for everyday drivers who do not require fine-tuned fuel pressure for their factory engines.
Product Description
Holley 12-704 Carbureted Fuel Pressure Regulator
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Customer Questions & Answers
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Question:
What is the purpose of the Holley 12-704 Carbureted Fuel Pressure Regulator?
Answer: The Holley 12-704 Carbureted Fuel Pressure Regulator is designed to regulate the fuel pressure in carbureted engines, ensuring stable and consistent fuel delivery. This regulator is essential for optimizing engine performance, especially in modified cars or racing applications. It helps prevent fuel pressure spikes that could lead to engine flooding or poor performance. Common scenarios for its use include high-performance street cars or race vehicles, where maintaining optimal fuel pressure is critical for engine efficiency and power output. -
Question:
How do you adjust the fuel pressure on the Holley 12-704 regulator?
Answer: Adjusting the fuel pressure on the Holley 12-704 regulator is straightforward. You'll find an adjustment screw on the top of the regulator. To increase pressure, turn the screw clockwise; to decrease, turn it counterclockwise. It's advisable to use a fuel pressure gauge to monitor the output while making adjustments. This ensures you're within the optimal range for your specific carburetor setup. This type of adjustment is particularly useful for tuning vehicles for performance changes, such as switching carburetors or modifying engine components. -
Question:
What fuel pressure range does the Holley 12-704 regulator support?
Answer: The Holley 12-704 Carbureted Fuel Pressure Regulator is designed to support a fuel pressure range of approximately 4 to 7 psi. This range is suitable for most carbureted applications. It’s important to match this pressure with your carburetor requirements, as too low or too high pressure can negatively affect the engine's performance and fuel efficiency. It’s particularly relevant for performance builds where precise tuning is necessary to achieve optimum air-fuel mixtures for power gains. -
Question:
Can the Holley 12-704 regulator be used with both gasoline and E85 fuel?
Answer: Yes, the Holley 12-704 regulator can be used with both gasoline and E85 fuel, making it versatile for different fuel types. However, it's crucial to ensure that all components in your fuel system are compatible with E85, as it can degrade certain materials over time. This ability to work with different fuels is excellent for automotive enthusiasts looking to explore various fuel options for performance or cost reasons, especially in racing or modified applications. -
Question:
What type of fittings does the Holley 12-704 use?
Answer: The Holley 12-704 Carbureted Fuel Pressure Regulator typically uses 3/8-inch fittings for both inlet and outlet connections. This standard size allows for easy integration into existing fuel systems without the need for complex modifications. Proper fitting helps to maintain a secure and leak-free connection, which is vital for engine safety and performance. Users often find this convenient when replacing old regulators or modifying their fuel systems to accommodate performance upgrades. -
Question:
What materials is the Holley 12-704 constructed from?
Answer: The Holley 12-704 Carbureted Fuel Pressure Regulator is constructed from high-quality anodized aluminum, providing durability and resistance to corrosion. This construction ensures long-lasting performance, even in harsh environments typical for racing or performance applications. The lightweight nature of aluminum also contributes to a reduction in overall system weight. This is particularly advantageous for performance enthusiasts who seek both reliability and efficiency in their high-performance builds. -
Question:
Is the Holley 12-704 regulator suitable for high-performance applications?
Answer: Yes, the Holley 12-704 regulator is particularly suited for high-performance applications. Its ability to maintain consistent fuel pressure under varying load conditions makes it a popular choice among racers and car enthusiasts. For those modifying their engines for increased power output, this regulator ensures that the carburetor receives the right amount of fuel for optimal performance. Scenarios include drag racing, road racing, or any high-performance application where fuel delivery consistency is critical. -
Question:
Is installation of the Holley 12-704 complicated?
Answer: Installing the Holley 12-704 regulator is not overly complicated and typically requires basic tools and mechanical knowledge. The regulator can be mounted easily in line with your existing fuel system, and instructions are often included for guidance. Proper installation ensures effective fuel pressure control and system integrity, which is crucial for engine health. Many users find it beneficial to install the regulator in an accessible location for future adjustments, especially when tuning for performance. -
Question:
Does the Holley 12-704 include a gauge port?
Answer: Yes, the Holley 12-704 Carbureted Fuel Pressure Regulator comes equipped with a gauge port. This feature allows for the easy attachment of a fuel pressure gauge, enabling users to monitor fuel pressure levels directly. Being able to see the real-time pressure ensures that you can make adjustments as needed, particularly when fine-tuning or troubleshooting your fuel system. This is an essential tool for anyone looking to optimize engine performance, especially in competitive settings. -
Question:
Where can I buy the Holley 12-704 Carbureted Fuel Pressure Regulator in Sierra Leone?
Answer: You can buy the Holley 12-704 Carbureted Fuel Pressure Regulator from Ubuy in Sierra Leone. Ubuy offers a reliable online shopping experience with a variety of automotive products, including performance parts like this regulator. Their platform provides customer support, comprehensive product details, and user reviews to help you make informed purchasing decisions for your automotive needs.
Holley Pressure Regulators 12-704 Editorial Review
The Holley Carbureted Fuel Pressure Regulator is a methanol compatible diaphragm regulator that holds the pressure preset at 6 lbs. It can handle fuel pressure between 4.5-9psi. There are no issues with the orientation of the regulator and it can be mounted upside down if required. The screw and lock nut control the pressure and its spring pressure regulator is not affected by its orientation. Overall, the Holley Carbureted Fuel Pressure Regulator is a reliable and methanol-friendly choice for car enthusiasts.
Customer Reviews & Ratings
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Pros
- Methanol compatible diaphragm
- Preset pressure setting of 6lbs
- Can be mounted upside down if required
- Reliable
Platform Trust & Buyer Confidence
JG
Jazz
Verified buyer
“Easy to use and always helpful and sorts any issues I've had past and present”
1 September 2026 · via Trustpilot
EK
Emmanuel
Verified buyer
“I always receive support when I engage customer service. Overall my experience with UBUY has been top notch. Keep up the good work.”
31 August 2026 · via Trustpilot
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fnd
Verified buyer
“The delivery was fast and the product came undamaged and authentic.”
29 August 2026 · via Trustpilot
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Leana
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“Ubuy is extremely efficient and to order online is an easy process. The verity of products to buy is really unlimited! My order was urgent and I got it on time. The products are great! Thank you Ubuy!”
25 August 2026 · via Trustpilot
HL
Hengo
Verified buyer
“Fast, convenient and cheap. Great store!”
27 August 2026 · via Trustpilot
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Features & Benefits
- Precise fuel pressure control from pump to carburetor.
- Adjustable from 4-1/2 to 9 psi for customization.
- Pre-set at the factory for easy initial installation.
- Includes one inlet and two outlet ports for flexibility.
- Comes with mounting hardware and fittings for convenience.
- Compatible with alcohol for versatile applications.
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