Rebate
Rebate
|
#42512840
Holley 12-840 HP Billet Carbureted Fuel Pressure Regulator, Adjustable
- It is adjustable from 4.5-9 psi for precise fuel pressure adjustments
- Made of billet aluminum with a black anodized base and clear anodize top for good looks
- To be used in systems where a return line is not needed
$137.65
/each
On Backorder
$152.95
Save $15.30
This part is Backordered. We estimate this item will ship on or before May 8th.
Quantity
Need Help? Call to Order
Add to a list
Select a vehicle to verify Fitment
Select Vehicle
Product Summary
Universal Fit, 4.5-9 Fuel Pressure Rating (psi)
- It is adjustable from 4.5-9 psi for precise fuel pressure adjustments
- Made of billet aluminum with a black anodized base and clear anodize top for good looks
- To be used in systems where a return line is not needed
- Has one 3/8" NPT inlet and two 3/8" NPT outlets
- Is comparable and interchangeable with popular Holley® 12-803 regulator
Rebates Available
See rebate detailsNeed To Know
Need help?
855.313.9176Quick and Easy Returns
Return PolicyHolley 12-840 Details
Holley 12-840 Details
Holley® Billet Fuel Pressure Regulators are part of a complete line of fuel system products from Holley®. They are precision machined from 6061-T6 billet aluminum for strength and durability. They feature a black bright dip anodized body and a clear bright dip anodized top for corrosion resistance and good looks. The Holley 12-840 fuel pressure regulator features 3/8" NPT in/out ports.
- 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
- One 3/8" NPT inlet and two 3/8" NPT outlets
- 1/8" NPT gauge port
- Comparable and interchangeable with popular Holley® 12-803 regulator
- Mounting bracket included
Charts
Rebates
Holley Fuel Up Spring Savings Event 2026
Save 10% instantly on select products across the Holley family of performance brands during the annual Holley Fuel Up Spring Savings Event 2026. Instant rebate period runs from March 30, 2026 through April 19, 2026.
Guides & Documents
Holley 12-840 Specifications
Holley 12-840 Specifications
| KEY SPECS | |
|---|---|
| MFG. Part # | 12-840 |
| Brand | Holley |
| Material Type | Aluminum |
| GENERAL | |
| Fuel Pressure Rating (psi) | 4.5-9 |
| Pressure Regulator Inlet Size | 3/8" NPT |
| Pressure Regulator Outlet Size | 3/8" NPT |
| Fuel Type | Gasoline |
| GTIN Code | 090127670453 |
Ratings & Reviews
4.3
3 Reviews
Customers give positive feedback about the product's quality and feature-set. The fuel pump works perfectly, demonstrating high-quality performance and immediate practical value. Its unique mounting feature stands out. While one customer replaced the pump after 3 years due to its mounting advantage, it's worth noting they would have considered other products if not for this particular aspect, showcasing the product's unique appeal versus competitors. Customers widely recommend it for its efficacy and unmatched features.
Ratings & Reviews
4.3
3 Reviews
Customers give positive feedback about the product's quality and feature-set. The fuel pump works perfectly, demonstrating high-quality performance and immediate practical value. Its unique mounting feature stands out. While one customer replaced the pump after 3 years due to its mounting advantage, it's worth noting they would have considered other products if not for this particular aspect, showcasing the product's unique appeal versus competitors. Customers widely recommend it for its efficacy and unmatched features.
4.3
3 reviews
5
2
4
0
3
1
2
0
1
0
Filter by Ratings
Looks great and well made
5.0
12 months ago
31Rat
Princeton NC
Verified
Part seems well made. Heavy and looks great on the '31.
Would Recommend
Works perfect
5.0
5 years ago
Armando M
El Paso, TX
Verified
New fuel pump was flooding my carb. This worked perfectly!
Would Recommend
Replaced the old one after only 3 years
3.0
7 years ago
69 Mustang
VA
Verified
I bought the same one because of unique mounting location of the first one, or else I would have bought a different model or brand.
Would Not Recommend
Showing 3 of 3 reviews