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Product Summary

Universal Fit, In Tank Electric Fuel Pump Type

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    Key Specs

    MFG. Part #12-135
    Electric Fuel Pump TypeIn Tank
    Free Flow Rate139 GPH / 525 LPH
    Maximum Pressure60 psi
    Voltage12 volts
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    Need To Know

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    Holley 12-135 Details

    The Holley In-tank RetroFit Fuel Modules are now available with a 525 LPH Pump. Convert your factory tank or fuel cell to an in-tank EFI fuel system quickly and easily! And- add the benefits of a Holley Hydramat in the process! The conversion is easily accomplished with basic tools and requires no welding or fabrication. The billet aluminum module design includes a billet pump hanger bracket to control pump vibration while also providing a low profile design to fit where space is at a premium. Holley's innovative clamping system and integrated fuel pump makes it easy. Supports up to 1200 EFI or 1450 Carb HP (@ 60 PSI at 13.5 Volts / 16.9 AMP Draw) Of course there are many variables, estimates are based on gasoline. Individual systems will vary based on fuel system design, regulator type, fuel cell location, etc...

    Features:

    • Retrofit Fuel Module 525 LPH-Returnless Style
    • Compatible for returnless style systems - no return to tank fuel line application
    • Installs in any fuel tank from 7.5" to 12" deep to fit a wide variety of applications
    • The low profile design is only 1.275" thick above the tank mounting surface for added clearance when needed
    • The innovative clamping system allows you to locate the module anywhere in the tank beside your existing sending unit
    • The clamping system allows you to rotate the unit 360 degrees for easier clocking of the plumbing and wiring locations under your ride
    • Includes innovative Holley Hydramat to ensure consistent fuel supply. The 3" x 15" HydraMat mounting flange has 6 clocking pin locations to allow for 360 degree adjustment to clear sending unit levels or any tank floor restrictions that you might encoun
    • Black anodized aluminum construction for corrosion resistance and long lasting good looks
    • ¼" NPT ports for a wide variety of plumbing options
    • Optional roll over valve available

    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.

    Holley 12-135 Specifications

    KEY SPECS
    MFG. Part #12-135
    BrandHolley
    Electric Fuel Pump TypeIn Tank
    Free Flow Rate139 GPH / 525 LPH
    Maximum Pressure60 psi
    Voltage12 volts
    GENERAL
    InlineNo
    Fuel System TypeEFI | Carb
    Fuel TypeGasoline | E85
    Electric Fuel Pump Outlet Fitting(s)1/4" NPT Female
    Horsepower Rating (Naturally Aspirated)1450 HP
    Material TypeBillet Aluminum
    Fuel Pressure Regulator IncludedNo
    Sending Unit IncludedNo
    Fuel Filter IncludedNo
    Fuel Line IncludedNo
    Clamps IncludedYes
    ApplicationReturnless-style system
    Overall Diameter4.8"
    Sold in QuantityEach
    GTIN Code090127069929
    Customer Impersonation Script