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Technical Holley fuel pressure regulator line size...help!!!

Discussion in 'The Hokey Ass Message Board' started by Blacktop Graffiti, Apr 14, 2018.

  1. Blacktop Graffiti
    Joined: May 2, 2002
    Posts: 938

    Blacktop Graffiti
    Member

    I have your average Holley fuel pressure regulator and I tried to run fuel line and it's too loose and the line itself can move in and out. As in it doesn't seal.

    Is there a special line that I need? I don't want to run AN fittings.

    Thanks!
     
  2. greybeard360
    Joined: Feb 28, 2008
    Posts: 1,154

    greybeard360
    Member

    Photos would help to see what you are dealing with.
     
  3. Blacktop Graffiti
    Joined: May 2, 2002
    Posts: 938

    Blacktop Graffiti
    Member

    Here you go.
     

    Attached Files:

  4. greybeard360
    Joined: Feb 28, 2008
    Posts: 1,154

    greybeard360
    Member

    Ok.... So what does the fitting look like you are trying to screw into it? That takes 3/8 pipe fittings... They make barbed fittings that fit for 5/16 and 3/8 fuel hose.... Ace Hardware, Lowe's, even auto supplies.
     
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  5. Blacktop Graffiti
    Joined: May 2, 2002
    Posts: 938

    Blacktop Graffiti
    Member

    It's just a standard 3/8 fuef line.
     
  6. razoo lew
    Joined: Apr 11, 2017
    Posts: 152

    razoo lew
    Member
    from Calgary

    Those look like 3/8 NPT. Pipe thread, not meant to screw a fuel line fitting into. You mention “fuel line moving in and out”, sounds like you need an NPT adaptor to tubing fitting adaptor of some description.
     
    swade41 likes this.
  7. pprather
    Joined: Jan 10, 2007
    Posts: 633

    pprather
    Member

    Sounds like you need a 3/8 NPT to 3/8 flair nipple


    Phil
     
    Johnny Gee, Scott and swade41 like this.
  8. mutant55
    Joined: Mar 11, 2012
    Posts: 153

    mutant55
    Member

    Agreed, 3/8 npt on the outlet ports, but it’s 1/2 npt on the inlet port on the bottom. I have used those regulators for years.
     
  9. squirrel
    Joined: Sep 23, 2004
    Posts: 39,256

    squirrel
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  10. Mike VV
    Joined: Sep 28, 2010
    Posts: 1,014

    Mike VV
    Member

    Simple really -

    What mutant55 and squirrel said.

    Mike
     
  11. jimmy six
    Joined: Mar 21, 2006
    Posts: 2,705

    jimmy six
    Member

    Carry an extra...for me they have been known to fail. Replaced with one from Aero Space Industries.......no more failures.
     
  12. porknbeaner
    Joined: Sep 12, 2003
    Posts: 40,088

    porknbeaner
    Member

    Mine is made for a 3/8 line. I suppose you could use an AN fitting, I am just using hose barbs on mine and a little stub of flex line. It makes it easy to plumb and also serves as a vibration damper.
     
  13. Blacktop Graffiti
    Joined: May 2, 2002
    Posts: 938

    Blacktop Graffiti
    Member

    Yep I'm using the barb style. It works great!!! Thanks everyone.

    Sent from my SM-J327P using The H.A.M.B. mobile app
     
  14. Bandit Billy
    Joined: Sep 16, 2014
    Posts: 3,492

    Bandit Billy
    ALLIANCE MEMBER

    This is mine, Holley 12-841 I think. 3/8 NPT inlets and outlets, I went the other way and converted NPT to AN fittings
    upload_2018-4-16_11-57-33.png
     

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