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Thread: Holley 12-131 Returnless EFI Fuel Pumps

  1. #1
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    Default Holley 12-131 Returnless EFI Fuel Pumps

    Has anyone tried these yet? I've been anxiously awaiting these but the installation instructions leave me a little bit lost. The instructions say, "adjust the fuel pressure regulator to the desired setting." What fuel pressure regulator? Is there one built it? I would assume not, since it is never mentioned in the instructions. If not, what fuel pressure regulator is recommended? Should we just use a 12-846 and cap off the return? When these were originally introduced at SEMA I sort of assumed they would be internally regulated, but maybe not? Thanks!

    Chris Myer
    http://www.HolleyInjection.Com
    800-880-0960
    Chris Myer
    800-880-0960 x654
    chris@EFISystemPro.com

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  2. #2
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    Default

    OK, I further studied the pump on the Holley.com website and it does confirm that that this pump:
    -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!

    However, I'm no less bewildered. The instructions say, "The gauge on the fuel pressure regulator should register between 55-60 for EFI."
    I have studied the images and I see no gauge anywhere, nor do I see anything that looks like a fuel pressure adjuster on the top of the unit.
    Chris
    Chris Myer
    800-880-0960 x654
    chris@EFISystemPro.com

    Check our www.EFISystemPro.com website for live stock status on
    all Holley items, including the full line of Holley HyperSpark Distributors!

  3. #3
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    The Holley 12-131 In-Tank Retrofit Fuel Module (Returnless) includes an internal fuel pressure regulator preset at 60 psi for a wide variety of applications. The return port (off the fuel pressure regulator) just dumps into the fuel tank, so there's no fuel return line.

    EDIT: You & I were typing at the same time. And I don't know about that fuel pressure gauge either.
    https://www.holley.com/brands/holley...t_fuel_module/ (Holley In-Tank Retrofit Fuel Modules)
    May God's grace bless you in the Lord Jesus Christ.

    '78 BRONCO: 508" stroker, TFS heads, 11:1 comp ratio, Dominator MPFI & DIS, cold air induction, Spal dual 12" fans/aluminum radiator, dual 3" exhaust/Magnaflow mufflers, Moroso vacuum pump, Accusump, engine oil & trans fluid coolers, 100HP progressive dry direct-port NOS, A/C, LenTech Strip Terminator wide-ratio AOD/2500 RPM converter, 3:1 Atlas II, modified Dana 44/60-lockers-4.10s, hydroboost/4-disc brakes, ram-assist/heim joint steering, Cage long radius arms, traction bars, 4" Skyjacker lift, 35" mud tires

  4. #4
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    Thanks Danny. So, it is not adjustable. Holley may want to tweak their instructions and take out the comments about adjustability & gauges then. Per 199R10934, "Now adjust the fuel pressure regulator to the desired setting."

    Sounds like this will be a perfect pump for LS applications, and anything else that wants to run 60 PSI. Thanks again! Chris
    Chris Myer
    800-880-0960 x654
    chris@EFISystemPro.com

    Check our www.EFISystemPro.com website for live stock status on
    all Holley items, including the full line of Holley HyperSpark Distributors!

  5. #5
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    Quote Originally Posted by cmyer View Post
    Thanks Danny. So, it is not adjustable. Holley may want to tweak their instructions and take out the comments about adjustability & gauges then. Per 199R10934, "Now adjust the fuel pressure regulator to the desired setting."
    Yes, I contacted Holley about this. They said the instructions are wrong, and will be rewritten. There is a fuel pressure regulator inside the module head, but it's not adjustable. It's preset to 58-60 psi. There's no fuel pressure gauge.
    May God's grace bless you in the Lord Jesus Christ.

    '78 BRONCO: 508" stroker, TFS heads, 11:1 comp ratio, Dominator MPFI & DIS, cold air induction, Spal dual 12" fans/aluminum radiator, dual 3" exhaust/Magnaflow mufflers, Moroso vacuum pump, Accusump, engine oil & trans fluid coolers, 100HP progressive dry direct-port NOS, A/C, LenTech Strip Terminator wide-ratio AOD/2500 RPM converter, 3:1 Atlas II, modified Dana 44/60-lockers-4.10s, hydroboost/4-disc brakes, ram-assist/heim joint steering, Cage long radius arms, traction bars, 4" Skyjacker lift, 35" mud tires

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