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Description
Holley In-Tank RetroFit Fuel Module-Returnless Style - 12-131Overview: 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
Overview:
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 8.5” 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
- 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 400LPH 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!
Application:
| Year | Make | Model | Submodel | Engine Size |
|---|---|---|---|---|
| Universal |
Specs:
| Application | Universal |
|---|---|
| Brand | Holley |
| Diameter | 4.8" |
| Emission Code | 3 |
| Free Flow LPH | 255 |
| Material | Billet Aluminum |
| NPT Thread | 1/4 NPT |
| Product Type | Fuel Pump Module |
| Warranty | Limited 90 Day |
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- 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
4.8 ★★★★★
Based on 10 reviews
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Product Reviews
★★★★★ 5
Tough Little Skwerls
Color: Squirrels (3-pack)
I bought these at the same time as I bought the Kyjen Hide-A-Squirel toy as I have 3 dogs and I figured at least one of the squirrels would get lost pretty quick leaving the dogs to squabble over the other two reamining squirrels. Ironically, all three of these squirrels are still present and accounted for though they are showing a bit of wear at this point. They are also covered with dog spit but as they are dog toys that is to be expected.
I have 2 medium sized dogs and one huge dog. Two of the dogs play with these toys EVERY DAY and after almost 3 months they squirrels are just now starting to show noticeable wear. My dogs love to dissect their toys and remove the squeaker. If I am on the ball I find the squeaker and tie it up in a couple of pairs of old socks and return it to the dogs. This solves two problems: 1. The dogs are unable to injest the squeker and 2. I no longer feel obligated to try to find the mates to those socks. The dogs also love the squeaky sock toys and wiill still play with the squeakerless squirrel toy carcasses so this is truly a win-win situation. At this point, 2 of the 6 total squirrels I ordered are sans squeaker. Three out of the six are showing any real wear. One out of the six total looks like new, probably because it has been under the dresser for the past two months. So, these squirrels are smart as well, or at least one out of six is of above average intelligence. Well played, Kyjen, well played.
These toys and the Kyjen Hide-A-Squirrel toy were all a big hit with my dogs, even with the dog that could care less about them because when I throw a squirrel for the other dogs to fetch, the dog who doesn't play with the toys chases the dogs that are running after the toy and screws with the slower dog by latching onto one of his hind legs and making him fall down. So, these toys entertain the dogs that actually play with them, the dog that couldn't care less about them, and me. That's getting the most possible bang for your buck right there!
This is the first time I bought any of Kyjen's products and I would absolutely buy Kyjen products again as well as reccomend them to my dog-owning friends. These are awesome toys. Yes, the squirrels are on the small side but I was expecting that as I actually took the time to read the product description before I ordered them. My dogs do not care that the squirrels are kind of small and I don't believe that the size of the toys has any impact on their durability or function.
These are awesome dog toys. If you don't get them for your dogs you are not a fun person and it's highly likely that your dog pees on you as you sleep. I sure would. I mean I would if I were your dogs.
Buy the damn toys already!
*HERE'S MY REVIEW OF THE KYJEN HIDE-A-SQUIRREL TOY*
This review is from: Kyjen PP01056 Hide-A-Squirrel Pet Toy, Large
I have 2 medium sized dogs and one giant dog and two of them love these toys. The other one likes to play with other dogs much more than she does dog toys so I'm not really surprised that she isn't that into them. The wierd dog and the giant dog LOVE these toys and play with them daily. They have taken both the squirrels and the "tree trunk" outside, played tug-of-war with them and even buried them and the toys are still looking pretty good after a couple of months of rough, frequent play. Two of the squirrels are now without their squeakers as the giant dog loves to dissect them and remove the squeakers. This isn't a problem, I actually expected he would have removed all of the squeakers by now and I bought three additional squirrels because I really expected these toys to wear out much more quickly. I'm pleasantly surprised at how well they are hanging in there. Of the six squirrels I ordered five are present and accounted for and the dogs play with all of them, even the ones giant dog has disemboweled.
Yes, the squirrels are on the small side. I was not surprised by this as I took the time to read the complete product description. I don't know how well other larger dogs would like these toys, my giant dog is touched in the head but very smart and he loves them despite the size.
I have never ordered Kyjen products before ordering this Hide-A-Squirrel toy and the replacement toys and I am thrilled that the toys are of such good qulaity and that my dogs are getting lots of "play" out of them. Even the one dog that doesn't like toys that much is entertained by them as she likes to chase the dogs that are playing with the toys and try to chew their legs off as they run. All my dogs are entertained and entertained dogs are dogs that are not running all over the neighborhood humping everything in sight or chewing holes in my socks.
I would absolutely order Kyjen products again and I would order from this seller again. My items arrived one day before they were due and were packed appropriately. I would also reccommend both Kyjen and this seller to other dog owners and have already told my sister about these toys and how awesome they are.
If I could give this product and this seller more than five stars I so would!
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Reviewed in the United States on April 25, 2013
★★★★★ 5
Healthy Squirrels
Color: Squirrels (3-pack)
Bought these years before and the squirrels have lasted. Well an exuberant teething corgi puppy has pulled the head "hair" off one. The whippet was miffed that the corgi girls liked them so I bought more. Cats like them too.
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Reviewed in the United States on May 6, 2026
★★★★★ 5
Perfect and would buy again and again
Color: Squirrels (3-pack)
This was our chiweinnie dogs favorite toys! Perfect for puppy curiosity. The male puppy is extremely rough play and works until he tears out the squeaker out of every toy we buy. Love that you can buy replacements affordably. He did finally win the battle but it was not easy to rip apart I give 5 stars to hold up to 4 pups and one destroyer dog.
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Reviewed in the United States on May 18, 2026
★★★★★ 5
Pups love these sneakers
Color: Squirrels (3-pack)
My pups really enjoy these toys—they love the squeakers and stay entertained chasing them around. Perfect size for small dogs and puppies, and they’re soft enough for indoor play. The only downside is they don’t hold up forever with heavy chewing, but for the price and fun factor, they’re definitely worth it.
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Reviewed in the United States on March 28, 2026
★★★★★ 4
Good for a small to medium dog
Color: Squirrels (3-pack)
These replacement ones were bigger than anticipated but work well for my small dog. Pretty durable (and she likes to destroy toys)
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Reviewed in the United States on March 25, 2026