Holley Billet Fuel Pressure Regulator


Holley Billet Fuel Pressure Regulator,

Street/Strip Carbureted Applications Two Port Adjustable from 4.5 to 9 PSI 3/8 NPT

SKU: 6656 Category: Brand:

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
Weight 2 lbs
Dimensions 6 × 5 × 5 in


weight 0.68
length 2.5
width 3.5
height 3.5
Brand Holley
Color Black Anodized
Emission Code 5
Fuel System Carbureted
Fuel Type Gasoline / Diesel / E85
Inlet Size 3/8 inch NPT
Material Aluminum
Outlet Size 3/8 inch NPT
Pressure Range 4.5-9 PSI
Product Type Regulator
Style Non-Return
Warning California Proposition 65
Warranty Limited 90 Day


There are no reviews yet.

Only logged in customers who have purchased this product may leave a review.

You may also like…

Ron Lummus Racing

2910 E. Miraloma Ave Suite B

Anaheim CA 92806

Tel No. (714) 630-2091

Fax. (714) 630-2092

Email: info@ronlummusracing.com

Connect On Social Media

Important Info

The following California proposition 65 warning applies to all products sold by Ron Lummus Racing. WARNING: This product can expose you to chemicals including nickel, which is known to the State of California to cause cancer or birth defects or other reproductive harm. For more information, visit: www.P65Warnings.ca.gov.

World Wide Sales

PayPal Credit Card Payments
Fedex, UPS, USPS & Freight Shipping




Get subscriber only offers and money saving coupons direct to your inbox. 

We don't share your info with 3rd parties.


Enjoy luxury, exclusivity and discretion


Get 25% Off & Free Shipping On Your First Order. Enter Code WELL25SPE

Scroll to Top