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Hot Rods Fuel pressure regulators

Discussion in 'The Hokey Ass Message Board' started by denis4x4, Oct 5, 2020.

  1. denis4x4
    Joined: Apr 23, 2005
    Posts: 3,548

    denis4x4
    ALLIANCE MEMBER
    from Colorado

    I have two A's with Weber 32/36 carbs. Both cars are using the Holley low pressure regulators. The Zipper is running 4 PSI and the CCPU is 2-1/2 PSI. Correct pressure should be no more that 3 PSI Cannot adjust the Zipper to less than 4 PSI. Question is, do I replace the regulator and/or the gauge? As always, thanks in advance for your input.
     
  2. Ericnova72
    Joined: May 1, 2007
    Posts: 429

    Ericnova72
    Member

    May just need to replace the diaphram in the regulator, they will get stiff with age. Holley sells a rebuild kit, but IIRC the diaphram is just the same as a 30cc accelerator pump diaphram
     
  3. Bandit Billy
    Joined: Sep 16, 2014
    Posts: 6,867

    Bandit Billy
    ALLIANCE MEMBER

    So...it sounds like your zippers stuck. :cool: New Holley 12-804 is 35 bones from Summit.
    upload_2020-10-5_14-49-2.png
    They claim adjustability from 1 to 4 PSI. There are other Holley regs that look like the 12-804 but cannot be turned down lower than 4 PSI. Like the Holley 12-803 which adjusts from 9-4.5 PSI. Visually identical.
    upload_2020-10-5_14-50-43.png
    Do you know for sure which one you have in the Zipper?
     
    Blues4U likes this.
  4. Try switching the two regulators & see if you get the same readings.
     
    Jet96 and Blues4U like this.

  5. 19Fordy
    Joined: May 17, 2003
    Posts: 6,921

    19Fordy
    Member

  6. ekimneirbo
    Joined: Apr 29, 2017
    Posts: 1,441

    ekimneirbo
    Member
    from Brooks Ky

    Are you sure its a real Holley? There were a bunch of counterfeit ones a while back but I don't know if Holley was one of the brands that was being ripped off.
     
    Bandit Billy likes this.
  7. denis4x4
    Joined: Apr 23, 2005
    Posts: 3,548

    denis4x4
    ALLIANCE MEMBER
    from Colorado

    These are both about six years old. Will buy a new one and a gauge for the Zipper.
     
  8. 41rodderz
    Joined: Sep 27, 2010
    Posts: 5,196

    41rodderz
    Member
    from Oregon

    :p You ever catch your..... in the zipper?:D
     
    Bandit Billy likes this.

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