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Holley In-Tank RetroFit Fuel Module 525 LPH Returnless Style 12-135

SKU: 12-135

Availability: In stock

Handling Time: 30 Days


Holley In-Tank RetroFit Fuel Module 525 LPH Returnless Style

525 LPH Drop-In Retrofit EFI Fuel System w/Hydramat
Supports up to 1200 EFI or 1450 Carb HP (@ 60 PSI at 13.5 Volts / 16.9 AMP Draw)

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...


  • Retrofit Fuel Module 525 LPH-Returnless Style
  • 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

Installation Note:It is recommended to use a Holley 12-753 30 Amp Fuel Pump Relay along with a minimum size of 12 Gauge wire for your installation.

*** Maximum 6AN line and fitting size due to space limitations between unit and fuel tank.


  • Application: Universal
  • Brand: Holley
  • Diameter: 4.8"
  • Emission Code: 5
  • Free Flow LPH: 525
  • Fuel Type: E85
  • Fuel Type: Gasoline
  • Material: Billet Aluminum
  • NPT Thread: 1/4 NPT
  • Product Type: Fuel Pump
  • Warranty: Limited 90 Day