SKU: 73130234449

Holley Retrofit Intank Fuel Module - Returnless (HO12-131)

Sale price$725.40 Regular price$806.00
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Description

Holley Retrofit Intank Fuel Module - Returnless (HO12-131)HO12 131 IN TANK RETRO RETURNLES MODULE 255 LPH, 550HP EFI Or 700HP Carb @ 60 PSI Part Number: HO12 131 Are you interested in an EFI retrofit kit, but just can't get past the complication of the fuel system? Holley is proud to introduce their Universal In Tank Retrofit Fuel Modules! Available in return and returnless versions, you can rest assured Holley has the solution you need for your EFI fuel pump woes. Now you can convert your factory tank or

HO12-131 - IN TANK RETRO RETURNLES MODULE

255 LPH, 550HP EFI Or 700HP Carb @ 60 PSI

Part Number: HO12-131

Are you interested in an EFI retrofit kit, but just can't get past the complication of the fuel system? Holley is proud to introduce their Universal In-Tank Retrofit Fuel Modules! Available in return and returnless versions, you can rest assured Holley has the solution you need for your EFI fuel pump woes.
Now you can 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. Once installed, hook up your fuel lines and your power source/ground and you're off and running! NO hassle!
Supports up to 550 EFI or 700 Carb HP (HP Rating @ 60 PSI at 13.5 Volts / 10.4 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:
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 encoun
Black anodized aluminium construction for corrosion resistance and long lasting good looks
1/4" NPT ports for a wide variety of plumbing options
Ideal for Terminator EFI, Sniper EFI, MSD Atomic EFI or any TBI of EFI conversion
Optional roll over valve available
Two different fuel pumps are available to match your requirements - 255LPH or 450LPH for both return and returnless style systems
Eliminates the need for a return line and conventional fuel pressure regulator. Thus, simplifying your installation
Includes an internal fuel pressure regulator preset at 60 psi for a wide variety of applications. No return line required!

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 73130234449

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4.6 ★★★★★
Based on 11 reviews
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A
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Angel Aguirre
Fort Morgan, US
★★★★★ 5
Why Struggle? It’s as easy as 1 , 2 , 3
Color: 14AWG-2 Lead
Love how simple the harness is! Bought this for a set of ditch lights for a 99 4runner. I love how much wire they give to let you run the wire to where it needs to go. 1st time buying and will come back for more in the future.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on December 10, 2025
E
Verified Purchase
Eric W.
Belleville, US
★★★★★ 4
Quality but short.
Color: 14AWG-2 Lead
Quality built harness but I wish they would make the switch wireing long enough to go from the dash to the battery area on film size vehicles.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on December 24, 2025
K
Verified Purchase
Kevin J Tully
Draper, US
★★★★★ 5
Fit and easy to install
Color: 14AWG-2 Lead
Exactly what I needed. Price was a lot better then I expected. Easy to install. Nice find
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 8, 2025
B
Verified Purchase
Buyer
Boise, US
★★★★★ 5
Great product
Color: 14AWG-2 Lead
A lot cheaper than getting wire, a relay, connectors, fuse, etc. Great durability, like the extra coating over the wires. Mounted the relays in a spot where they get totally soaked. They were sitting in water when I tested them out they works great so I’d say water resistant is an understatement. Overall great product.
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Reviewed in the United States on October 24, 2022
A
Verified Purchase
Amazon Customer
Port Orchard, US
★★★★★ 5
Makes wiring lights faster and cleaner
Color: 14AWG-2 Lead
Harness is well insulated and much easier to use than running wires separately. I’ve installed 2 kits and they work well. Greatly simplifies wiring auxiliary lights on a vehicle.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on August 13, 2023

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