Brand: Holley
Holley Diecast 12-158 In-Tank RetroFit Fuel Module Returnless System
Holley 12-158 is a diecast in-tank retrofit fuel module returnless system.
Currently out of stock
No hidden fees — taxes included in the price & Free Shipping.
We accept major cards and digital wallets. Additional installment plans, when available, are offered by Shopify at checkout based on order eligibility.
Why shop with us
Holley Diecast 12-158 In-Tank RetroFit Fuel Module Returnless System
The 255 LPH Drop-In Retrofit EFI Fuel System w/Hydramat supports up to 550 EFI or 700 Carb HP (HP Rating @ 60 PSI at 13.5 Volts / 10.4 AMP Draw).
Interested in an EFI retrofit kit but can't get past the complication of the fuel system?
Holley proudly introduces their Universal In-Tank Retrofit Fuel Modules!
Available in return and returnless versions, you can rest assured that Holley has the solution you need for your EFI fuel pump woes.
Convert your factory tank or fuel cell to an in-tank EFI fuel system quickly and easily!
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 aluminum module design includes a die cast pump hanger bracket to control pump vibration while providing a low profile 5 inch diameter design to fit where space is at a premium.
Holley's innovative clamping system and integrated fuel pump make 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 (@ 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.
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.
Key Features
Specifications
- Length
- 19.4 lb
- Width
- 6.5 lb
- Height
- 6.4 lb
- Weight
- 3.1 lb
- ASIN
- B077HRW7KF
- UPC
- 090127017678
- Ships From
- United States
- Brand
- Holley
Frequently Asked Questions
About Holley Diecast 12-158 In-Tank RetroFit Fuel Module Returnless System
01 What is the fuel system's flow rate?
The flow rate is 255 LPH.
02 What horsepower does it support?
It supports up to 550 EFI or 700 Carb HP.
03 What is the diameter of the design?
The design has a low profile diameter of 5 inches.
04 What is the ASIN for this product?
The ASIN for this product is B077HRW7KF.
05 What is the UPC / barcode for this product?
The UPC/barcode for this product is 090127017678.
06 Where does this ship from?
Orders ship from our fulfillment center in Dover, Delaware, USA.
07 How many days will it take to arrive?
Orders ship within 1-2 business days and typically arrive within 4-5 business days via free standard shipping -- usually by Aug 29.
08 Does this product accept returns?
Yes -- this item can be returned within 15 days of delivery for a free return by mail. See our return policy for full details.








