Made in USA
12-840KIT Billet Bypass Fuel Pressure Regulator Kit, 4.5-9 psi [3/8 in. NPT Inlet/Outlet]
InfoVehicle Info Needed
HOLLEYPART NUMBER: 510-12-840KIT

12-840KIT Billet Bypass Fuel Pressure Regulator Kit, 4.5-9 psi [3/8 in. NPT Inlet/Outlet]

$34995
ShippingShips on 09/16/2026
Lowest PriceLowest Price Guarantee

Universal Bypass Regulators
Billet Bypass Fuel Pressure Regulator Kit
  • Carbureted Applications
  • 3/8 in. NPT Inlet/Outlet Ports
  • 1/8 in. Gauge Port
  • 4.5-9 psi Adjustment
  • Non-Return
  • Includes:
      (3) 3/8 in. NPT to -6AN Fittings
    • (1) Fuel Pressure Gauge

      Holley 12-840KIT Features:

      The Holley Billet Bypass Fuel Pressure Regulator Kit includes a durable billet aluminum body with a sleek black finish, offering corrosion resistance and an attractive appearance. The regulator is equipped with 3/8-inch NPT in/out ports and a 1/8-inch NPT gauge port and comes with (3) Mr. Gasket 3/8-inch NPT to -6 AN fittings. Additionally, the kit features a barbed fitting for the vacuum port, a sturdy mounting bracket, and all necessary hardware for easy installation.

    Emissions Note:

    This part is only legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles or on vehicles used solely for the purposes of closed competition racing.

    CLICK THIS LINK FOR IMPORTANT CARB & EPA EMISSIONS INFORMATION ABOUT THIS PART

  • Part TypeFuel Pressure Regulator
    BrandHOLLEY
    Package Height5.6
    Package Width6.5
    Package Length6.8
    Weight1.35 PG
    Part CategoryPerformance Parts
    Regulator FinishBlack anodized
    Outlet Size3/8 NPT
    Inlet Size3/8 NPT
    Regulator MaterialBillet aluminum
    Gauge IncludedYes
    Outlet QuantityOne
    QuantitySold as a kit
    Pressure Rating4.5-9 psi
    Inlet AttachmentFemale Threads
    Mounting Bracket IncludedYes
    Gauge PortYes
    Outlet AttachmentFemale Threads
    Fittings IncludedYes
    Inlet QuantityOne
    Part FitmentUniversal
    Regulator StyleNon-Return
    Vendor Part Number12-840KIT
    Package Qty1
    Package TypeEA
    No Questions
    No Reviews
    Some parts are not legal for use in California or other states with similar laws / regulations
    p65 warning
    Your Cart

    Your shopping cart is empty!