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Holley In-Tank Retrofit Fuel Module, Returnless Style, 525 LPH

$855.95

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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)
  • Retrofit Fuel Module 525 LPH-Returnless Style
  • The easiest way to convert your vehicle to an in-tank, EFI fuel system
  • 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 encounter
  • Black anodized aluminum construction for corrosion resistance and long lasting good looks
  • 1/4" NPT ports for a wide variety of plumbing options
  • Optional roll over valve available
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.


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  • Model: 12-135
  • FROM: Holley

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we added this on Monday 11 November, 2019.

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