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    • HP Billet Carbureted by Pass Fuel Pressure Regulator Return Size 3/8 Inch NPT Street/strip Carbureted Applications Two Port Adjustable from 4.5 to 9 PSI Holley
    • HP Billet Carbureted by Pass Fuel Pressure Regulator Return Size 3/8 Inch NPT Street/strip Carbureted Applications Two Port Adjustable from 4.5 to 9 PSI Holley
    • HP Billet Carbureted by Pass Fuel Pressure Regulator Return Size 3/8 Inch NPT Street/strip Carbureted Applications Two Port Adjustable from 4.5 to 9 PSI Holley
    • HP Billet Carbureted by Pass Fuel Pressure Regulator Return Size 3/8 Inch NPT Street/strip Carbureted Applications Two Port Adjustable from 4.5 to 9 PSI Holley
    • HP Billet Carbureted by Pass Fuel Pressure Regulator Return Size 3/8 Inch NPT Street/strip Carbureted Applications Two Port Adjustable from 4.5 to 9 PSI Holley
    • HP Billet Carbureted by Pass Fuel Pressure Regulator Return Size 3/8 Inch NPT Street/strip Carbureted Applications Two Port Adjustable from 4.5 to 9 PSI Holley
    • HP Billet Carbureted by Pass Fuel Pressure Regulator Return Size 3/8 Inch NPT Street/strip Carbureted Applications Two Port Adjustable from 4.5 to 9 PSI Holley
    • HP Billet Carbureted by Pass Fuel Pressure Regulator Return Size 3/8 Inch NPT Street/strip Carbureted Applications Two Port Adjustable from 4.5 to 9 PSI Holley
    • HP Billet Carbureted by Pass Fuel Pressure Regulator Return Size 3/8 Inch NPT Street/strip Carbureted Applications Two Port Adjustable from 4.5 to 9 PSI Holley
    Sale!

    Holley HP Billet Carbureted Bypass Fuel Pressure Regulator, 4.5-9 PSI, 3/8 in NPT | 12-841

    Vendor: Holley
    Part Number: 12-841
    Save $21
    Sale Price $167.95 Regular Price $188.95

    Available to order. In-stock orders typically ship in 1 to 2 business days.

    Not sure it fits your vehicle?
    Email sales@berryperformancesales.com with your year, make, model and engine, and we'll help you check fitment before you order.
    Fast Fulfillment: In-stock orders typically ship within 1 to 2 business days.
    Free Shipping on Orders Over $99 | Excludes freight shipments
    International Shipping Available: email sales@berryperformancesales.com for a quote.
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    Part of Holley's complete billet fuel pressure regulator lineup, this regulator is precision machined from 6061-T6 billet aluminum for strength and durability, with a black bright dip anodized body and clear bright dip anodized top for corrosion resistance. It's designed for use with electric pumps only in systems with a return line back to the tank.

    Specifications:

    • Brand: Holley
    • Category: Air and Fuel Delivery
    • Color: Black Anodized
    • Fuel System: Carbureted
    • Material: Aluminum
    • Inlet Size: 3/8 in. NPT
    • Outlet Size: 3/8 in. NPT
    • Return Size: 3/8 in. NPT
    • Gauge Port: 1/8 in. NPT
    • Pressure Range: 4.5-9 PSI
    • Style: Bypass
    • Product Type: Fuel Pressure Regulator
    • Sub Category: Carburetion
    • Warranty: Manufacturer's Limited 90 Day Warranty
    • Part Number: 12-841

    Compatible with Diesel #1 and Diesel #2 fuel. Comparable and interchangeable with the popular Holley 12-803BP regulator. Mounting bracket included.

    FAQ

    Can this regulator be used with a mechanical fuel pump?

    No, it's designed for use with electric pumps only.

    What port sizes does it use?

    One 3/8 in. NPT inlet, one 3/8 in. NPT outlet, one 3/8 in. NPT return, plus a 1/8 in. NPT gauge port.

    What pressure range is this regulator adjustable across?

    It's adjustable from 4.5 to 9 PSI.

    Shipping Policy
    • Free shipping on orders over $99 (excludes freight shipments).
    • In-stock orders typically ship within 1 to 2 business days. Weekend and holiday orders are processed the next business day.
    • Orders ship from Defiance, Ohio and a nationwide network of warehouses and manufacturers.
    • Items showing an ETA are not in stock yet. ETAs come from the manufacturer and can change.
    • No P.O. Boxes. International orders need a shipping quote, so email us first.

    Read the full Shipping Policy

    Return Policy
    • 30-day return window from the ship date. Returns must be approved first; email sales@berryperformancesales.com with your order number.
    • Items must be unused, complete and in the original packaging.
    • A 20% restocking fee applies, and return shipping is paid by the buyer.
    • Not returnable: installed or modified parts, opened or used programmers and tuners, custom orders, Open Box, and Clearance or Final Sale items.
    • Damaged, defective or incorrect items must be reported within 48 hours of delivery with photos.

    Read the full Return Policy

    Disclaimer

    All products are sold for off-road use only unless otherwise specified. Buyer assumes all responsibility for installation and operation. Seller is not liable for any incidental, indirect, or consequential damages — including engine failure, labor costs, or vehicle downtime — resulting from the use of any product sold.

    By making a purchase from Berry Performance Sales, you acknowledge and agree to abide by the terms and conditions of these Policies.

    For any questions or concerns, please contact us — we’re always happy to help.

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