Holley problem(s)
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Holley problem(s)

  1. #1
    Member TrynPas's Avatar
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    Default Holley problem(s)

    I've got some carb issues. Last year I bought a rebuilt Holley 750 DP (list 9379) from a builder on Ebay (I know....I know) and can't return it, nothing but problems with this guy. I paid him a little extra for what he called a 'stage 2' carb (whatever that means). When I finally put it on my engine (stock 460 BBF), I put fuel to it and gas started pouring out of the vent tubes into the bowls. I pulled the sight plugs and have been trying to adjust the floats, but I've got them cranked so far clockwise that the adjustment (in the fuel bowl) is now below the adjustment nut, but the fuel is still too high. I've got those nitrophyl floats too. Also, I'm guessing I'm gonna have issues with idle mixture screws (I have four of them), how do you adjust those? Thanks in advance for the help.
    Quote Originally Posted by HawaiianJet View Post
    You done got my kentucky ass all confused!!!

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    Member TrynPas's Avatar
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    I took both bowls off and when I flipped them upside down (read it on a previous post here), the float barely even moves (stays towards bottom of the bowl. I have full adjustment (I tried it while I had the bowls off) but the floats just aren't keeping fuel from coming. BTW I have an electric fuel pump with a regulator and my gauge says 4psi. This is the same pump/reguator that I used last year, before I tore the motor down, and they were fine.
    Quote Originally Posted by HawaiianJet View Post
    You done got my kentucky ass all confused!!!

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    058
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    Fuel is getting by the needle/seat or the small O ring that seals the needle/seat assembly. Try changing it or at least remove it and make sure there is no debris in the seat and check the O ring for cracks, hardness, flattening. It should be plyable, round and in one piece....Easier just to change them and when you do put a little bit of grease on the O ring and install carefully.

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    yeah what he said

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    Quote Originally Posted by 058 View Post
    Fuel is getting by the needle/seat or the small O ring that seals the needle/seat assembly. Try changing it or at least remove it and make sure there is no debris in the seat and check the O ring for cracks, hardness, flattening. It should be plyable, round and in one piece....Easier just to change them and when you do put a little bit of grease on the O ring and install carefully.
    How do get to that o ring? I pulled the float bowls off earlier and removed the two screws inside, thinking that was where I needed to be but I couldn't remove the float. Is this where I need to go? Or do I pull the adjust ment out of the top? Also, I just figured out that my secondary accelerator pump won't squirt gas. When there's gas in the carb the secondaries were REAL TIGHT, so I traced the problem to the accelerator pump (secondary side). It seems clogged somewhere between the pump and the little nozzle that squirts. I moved the little bb in the pump and gas will go in the hole, and I removed the nozzle on the top of the carb and it's all dry. Where's a good place to start with that problem? Man I will never buy anything on Ebay again....I promise!!!!!!
    Quote Originally Posted by HawaiianJet View Post
    You done got my kentucky ass all confused!!!

  8. #6
    steelcomp was here
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    The needles and seats come out of the top of the float bowl where the adjusters are. If you've screwed them down too far, you might have to remove the nut, and just install the screw in the top of the needle and seat, and pull it out that way. The o-ring is on the needle and seat. Definately getting fuel past the needle and seat somehow. Sounds like you just need to buy a kit for the carb and go through it. It's a little complicated the first time around, but Holleys are as simple as it gets, and there's enough help here to get you through it. Just take the carb as far apart as you can keeping track of where things go, so you can re-assemble it. (Unfortunately there's no guarantee it's even been put together correctly if someone else has had it apart) Use compressed air and blow out all the passages...every teeny little hole from both directions, and then you can re-assemble with new gaskets and needle and seat assemblies. If the carb is dirty, you can use spray carb cleaner or some solvent and a brush, and rinse with warm water, then the compressed air.
    Last edited by scott foxwell; 06-28-2008 at 04:07 PM.
    If God is your co-pilot, change seats!
    Acts 2:38, the perfect answer to the perfect question.

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    Resident Ford Nut Sleeper CP's Avatar
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    I was having issue's with the float's once and come to find out the adjuster hand bottomed out and collapased in the top of the float. It was bottomed out and therefore was out of adjustment. Check yours to make sure the same thing isn't happening.

    Sleeper CP

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    Well.....one problem fixed. I pulled the valve/seat assembly out and there was some crap/dirt on the needle (primary and secondary). cleaned it off, but I pulled the bowls just to make sure I got it all too. I saw on this forum that you can adjust them to be close by holding the bowl upside down. I did that but I had to bend the tabs on both floats to give me some room for 'adjustment'. OK....now I've got the problem with the secondary accelerator pump not squirting. It works good at the bowl, but something isn't letting it get to the squirter. After I pulled the squiter out, it looks like there a screw (pointing up), do I have to pull the base off of the carb to get to it? I know I probably should just rebuild this thing (again), but I'm kind of wanting to go out tomorrow so I'd just like to fix this problem. Any ideas how to best unplug this? Thanks for all the help so far.
    Quote Originally Posted by HawaiianJet View Post
    You done got my kentucky ass all confused!!!

  11. #9
    steelcomp was here
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    There's no screw under there. There is a small check valve under the discharge nozzle (squirter). It looks like a little missle...it's steel, and round, and pointed on one end. The pointed end should face down. This thing should just fall out in your hand when you turn the carb upside down. If it dosen't, it's stuck, and probably the reason your squirter isn't working.
    If God is your co-pilot, change seats!
    Acts 2:38, the perfect answer to the perfect question.

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    Steel really has worked on something before! J/K These guys here will straighten you out

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    steelcomp was here
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    Quote Originally Posted by MACHINEHEAD1 View Post
    Steel really has worked on something before! J/K These guys here will straighten you out
    Don't let that fool ya...I read it somewhere...
    If God is your co-pilot, change seats!
    Acts 2:38, the perfect answer to the perfect question.

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    Quote Originally Posted by steelcomp View Post
    Don't let that fool ya...I read it somewhere...
    I bet it was Car Craft

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    steelcomp was here
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    Quote Originally Posted by 058 View Post
    I bet it was Car Craft
    If God is your co-pilot, change seats!
    Acts 2:38, the perfect answer to the perfect question.

  16. #14
    Or Seth, either one Budweiser's Avatar
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    It's been a while since I've delved into a Holley so I could be incorrect. But, isn't it possible the wrong gasket has been used on the metering block/plate which would block that passage? I seem to recall reading something about that in the rebuild kit directions. Maybe it was a dream???

    Just thought I'd throw it out there. Good luck!

    -Seth-

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