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  1. #1
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    Holley carb fuel fittings

    Hey all,

    I have a Holley QuickFuel Street-Q 750 carb but I think this probably applies to (all? most?) Holley 4150-style carbs.. anyhow, this carb is what I have: https://www.holley.com/products/fuel...p/parts/SQ-750

    If you go looking for fuel fittings there is a truly bewildering array of fittings available! Any suggestions on what to go for? I'm struggling to work out if some of them are "intermediate" fittings because I can't seem to find documented what thread the carb itself has in it as standard; Holley's instructions are universal and just says "Install fuel inlet fittings. DO NOT USE PTFE TAPE ON INVERTED FLARE FUEL INLET FITTINGS"

    Gee, thanks Holley

    So .. for a Holley carb noob, any suggestions? I have a Filter King filter/regulator which currently has an AN-6 outlet but that's just threaded into a 1/8 NTPF hole so I am pretty flexible in terms of options (it could be replaced by a simple barb, for example).

    Thoughts, comments, smart remarks etc appreciated

    [edit] I was thinking of something like this - https://www.topspeedautomotive.com/c...861001138.html - because it could be configured to point either forward or backward, but the fittings look totally different to what came with the carb on my old engine, which looks like this - https://www.topspeedautomotive.com/c...861043619.html

    And then I confused myself.
    Last edited by aaronjb; 15-04-21 at 01:00 PM.
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  2. #2
    Join Date
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    You should be able to work your way through it if you know what you want to do. Summit has all the fittings https://www.summitracing.com/search?...20for%20holley or alternatively your local specialist might be able to help, especially if you can take the carb in, Covid rules permitting!! How about CM Frost??? They are near you and should have everything. Or, Competition Supplies in Silverstone, they are good.
    Dax with 1964 Dual Quad 427 and Toploader box

  3. #3
    Join Date
    Jan 2002
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    Reading, Berks, UK.
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    Have you looked at Realsteel ? they seem to have enough to sort you out, if not give the boys at RaceParts in Wallingford a call, they tend to have everything or can get it, enough shiny bits to keep you happy for hours

  4. #4
    Join Date
    May 2003
    Location
    Hampshire
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    161
    Depends what the rest of the fuel system is like.

    from carb, running back to the tank my system goes like this;

    im running a 4150 DP and have got one of the hard line carb fittings as per the picture from top speed automotive, except mine has an aperture for a pressure gauge which I used to adjust the line pressure. Pressure gauge is then removed, replaced with a blanking plug during use. It then goes to a flexible fuel hose to the 3/8 hard line that goes back along the chassis to the boot area before going to another fuel hose into the boot to the filter king filter and regulator, another flexible line to the pump and yet another to the tank.

    all hose is just bare hose, no covering. I did think about the flexible carb fitting, which does look nice but I’ve had 2 scares with my rubber hoses which now means I won’t fit anything to the fuel system where I can’t visually inspect the hose condition. Both issues I think might be ethanol issues and were a few years ago so recent hose development might be better. Both issues, one in the engine bay and one in the boot could have easily have ended in a burnt cobra.

    all hose joints are hose clipped to barbed fittings or the hard line which has a retaining bead on each end. It’s simple, effective and easily inspectable. Just not aesthetically pleasing.
    Roger

    RamSC 351 Cleveland

    on the road 20 years- nearly finished

  5. #5
    Join Date
    Jun 2016
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    Nantwich Cheshire
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    I used Torques for all my fuel fittings. They have pretty much everything and at a reasonable price.


  6. #6
    Join Date
    May 2004
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    Cowbridge, United Kingdom
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    10,278
    Another vote for Torques or Hose Fittings UK
    Both on eBay and offer fast delivery.
    Kev Davies
    South Wales Area Rep. UKCC Membership Secretary
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  7. #7
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    Quote Originally Posted by RogerKnill View Post
    Depends what the rest of the fuel system is like.
    The rest of my fuel system is all AN fittings from Torques UK with either aluminium hard-line or teflon-lined nylon braided hose I had AN fittings welded to the fuel tank when I had the breathers added by Olliminium.. it actually goes something like this (right now, subject to change )

    Tank -> Shut-off valve -> Pre-filter -> Pump (all in teflon-lined hose) -> fuel filter (aluminium hard-line) -> ... -> Carb

    It's missing the bit described by dots right now

    im running a 4150 DP and have got one of the hard line carb fittings as per the picture from top speed automotive, except mine has an aperture for a pressure gauge which I used to adjust the line pressure. Pressure gauge is then removed, replaced with a blanking plug during use.
    I actually have one of those - identical to what you describe with the pressure gauge (though there's also a pressure gauge on my fuel filter which, likewise, will need blanking off). If I fit it facing the 'right' way (the neatest way) then IIRC the pressure gauge ends up upside down but I suppose that doesn't matter if it's just a 1/8 NPT blanking plug.. only thing is, it came with my previous engine's Holley 650 and I haven't tried to see if it fits the QuickFuel yet so I don't know if the fittings are actually right

    Quote Originally Posted by Bigblock View Post
    Have you looked at Realsteel ? they seem to have enough to sort you out, if not give the boys at RaceParts in Wallingford a call, they tend to have everything or can get it, enough shiny bits to keep you happy for hours
    Quote Originally Posted by ChrisP View Post
    You should be able to work your way through it if you know what you want to do. Summit has all the fittings https://www.summitracing.com/search?...20for%20holley or alternatively your local specialist might be able to help, especially if you can take the carb in, Covid rules permitting!! How about CM Frost??? They are near you and should have everything. Or, Competition Supplies in Silverstone, they are good.
    Quote Originally Posted by kdavies3 View Post
    Another vote for Torques or Hose Fittings UK
    Both on eBay and offer fast delivery.
    Re the above - yep, they probably all have what I need .. I just like to know what I'm asking for when I phone up; especially in the case of Real Steel, they always seem rather grumpy if you don't! Bit like an old school motorfactors, I suppose, I remember those always being staffed by grumpy old buggers too

    Problem is, I'm not sure what the thread/fittings are in the carb itself, and given Holley/Summit/et al seem to list an absolute myriad of different options, I figure I must be misunderstanding it - because how can a 'standard' 4150 style carb have 12 different threads

    A bit of googling suggests 4150s are 7/8-20 thread fittings? (https://www.performanceboats.com/thr...se-help.89022/)

    That makes me think that perhaps there are intermediate adapters needed for the chrome fuel rails, as seen here: https://www.holley.com/products/fuel...nes/parts/1552

    I guess I need to go down to the garage and see if the one I have fits.. if it does then I must already have adapters in there to go from 7/8-20 to 5/8-18 inverted flare. I think..
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  8. #8
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    Ah, confirmation I think: https://www.holley.com/products/fuel...s/34-6000SSQFT

    "SS Fuel Line #6AN Silver - fits Q-Series, SS-Series, and all other 4150 style carburetors with dual metering blocks and 7/8"-20 threaded fuel bowls."

    The good news is, I probably have enough fittings and hose to make up a fuel rail, just need the 7/8-20 to AN- adapters. I'll have a fiddle..
    My DeDion build diary..
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  9. #9
    Join Date
    Jan 2002
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    Reading, Berks, UK.
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    Quote Originally Posted by aaronjb View Post

    The good news is, I probably have enough fittings and hose to make up a fuel rail, just need the 7/8-20 to AN- adapters. I'll have a fiddle..[/FONT][/COLOR]
    You prob have enough fittings in your garage stash to restock most of the suppliers

  10. #10
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    Only half true... :P
    My DeDion build diary..
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