Holly Float question
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Holly Float question

  1. #1
    Senior Member H20MOFO's Avatar
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    Default Holly Float question

    So I'm bored the garage bolting on a air scoop I bought 3 years ago... and I decide maybe I should check fuel level in the bowls. So I hit the key on for a couple of seconds(elec. pump.) and the primarys come just below the sight windows. First question is that right , should the fuel be in the center of the windows or bottom. So then I look in the secondarys and I'll I see is the brass float. So I turn the key on for a few more seconds. No difference. So i figure its stuck, I grab a pop rivet and its not stuck it's floating. Second question which way do I turn the adj. screw? It's already all the way in...when I shake the boat and trailer(pretty hard ) a little fuel comes out. When I back the screw off a turn it seems to make it lower. Thats all the adj. I have is about 1 turn then I run out of threads. Do I need to bend the float or some thing? maybe take the lock nut and file it a little thinner? WTF??? If it matters it's a 800 cfm dbl pumper.
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  3. #2
    E-7 Sheepdog (ret) SmokinLowriderSS's Avatar
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    The float level should be the bottom of the window. Lowering the float level can only be properly accomplished with the ENGINE running (to suck fuel out of the bowl).

    How you'd ever adjust them to the middle since they are designed to be adjusted running is a mystery to me (unless you buy the aftermarket clear plugs). A LOT of leakage pouring gasoline everywhere, on a hot motor.
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  4. #3
    Senior Member Oldsquirt's Avatar
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    Correct level is right at the bottom of the window.

    The nut is the adjuster, not a locknut. The screw is the lock. Crack it loose and then turn the nut counterclockwise to raise level, counter clock to lower it. Go slowly, about 1/4 turn at a time, to allow fuel level to catch up to your adjustment.

    When you are done, recheck with boat on the water. If the levels are correct, take the plastic sight plugs out and reinstall the brass plugs. Those plastic ones have been known to break, with a resultant possibility of fuel leaking out.

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  6. #4
    Senior Member ol guy's Avatar
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    Quote Originally Posted by H20MOFO View Post
    So I'm bored the garage bolting on a air scoop I bought 3 years ago... and I decide maybe I should check fuel level in the bowls. So I hit the key on for a couple of seconds(elec. pump.) and the primarys come just below the sight windows. First question is that right , should the fuel be in the center of the windows or bottom. So then I look in the secondarys and I'll I see is the brass float. So I turn the key on for a few more seconds. No difference. So i figure its stuck, I grab a pop rivet and its not stuck it's floating. Second question which way do I turn the adj. screw? It's already all the way in...when I shake the boat and trailer(pretty hard ) a little fuel comes out. When I back the screw off a turn it seems to make it lower. Thats all the adj. I have is about 1 turn then I run out of threads. Do I need to bend the float or some thing? maybe take the lock nut and file it a little thinner? WTF??? If it matters it's a 800 cfm dbl pumper.
    H2 Dont do sqwat the floats do not stick the needle sticks to the seat!!! Take the screw out then back the nut off and remove the needle and seat wiggle it around with a spray of any lube and reinstall, The top of the needle and seat being about .035 above the bowl seat area. Then rerun the pump and adjust. M

  7. #5
    Senior Member H20MOFO's Avatar
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    Thanks guys. I do have the clear window plugs, and I always thought it was supposed to be at the bottom of the sight plug, but a guy at work told me the center.(I guess he was wrong). As far as adjusting them that would explain my issue I thought the sloted "screw" was the adj. not the nut. thanks for clearing that up. As far as adjusting it running.....that makes sense for the primarys..I guess.. But to adjust the secondarys.. are you telling me I need to adjust those at 4000 rpm's or when ever they open. or that fuel is being sucked out of those at idle also???? I thought with an elec. pump you could set float levels without the boat running, as opposed to having a manual pump. Edit ol guy you and I were posting at the same time...If I have some fuel in there then I don't have a stuck needle right??? Just an adjustment issue???
    Last edited by H20MOFO; 05-26-2008 at 04:49 PM.
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    Senior Member Oldsquirt's Avatar
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    Kreg, it only takes a minute to pull the needle and seat as suggested by "ol guy". May as well do it to be sure. As far as adjusting on the trailer, yes you can with the electric pump. You should recheck on the water, though, as the carb may be at a slightly different angle than it is on the trailer.

    As for the sight glasses and float levels........on a Demon carb with built in "windows", I believe the correct level would be the middle. This is the same as many OE Japanese carbs that had fuel level windows. On Holley carbs, the correct level is the bottom of the opening, and since the title of the thread implies it is a Holley carb.............

  9. #7
    Senior Member H20MOFO's Avatar
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    Thanks ol squirt, and all. I finally got it. I did have to pull the whole 9 yards just to understand what is going on.. The top sloted screw is threaded into the needle and the nut locks against that. I'm pretty sure I've been boating for a couple of years with my secondarys 3/4 (or less) full. That should help my top end and not to mention maybe my plug reading issues (rich everywhere and starving at wot). Thanks again all. EDIT. just for the record(in case it may help someone else) no matter how much I turned that nut, nothing changed, it(the nut) was so far down the needle, it was out of threads.
    Last edited by H20MOFO; 05-26-2008 at 06:50 PM. Reason: Too many beers
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    Senior Member H20MOFO's Avatar
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    Went to the ramp yesterday and baiscly hydro locked my motor with fuel. didn't really figure out what was going on at the ramp cause every time I looked at the little sight window everything looked ok..not, I've put so much gas down my carb I'm worried about my oil. EDIT;O.k I think I've removed my head from my ass now. Got her adjusted.
    Last edited by H20MOFO; 05-31-2008 at 08:57 AM.
    Another Hot Boat refugee

  11. #9
    Senior Member ol guy's Avatar
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    Quote Originally Posted by H20MOFO View Post
    Went to the ramp yesterday and baiscly hydro locked my motor with fuel. didn't really figure out what was going on at the ramp cause every time I looked at the little sight window everything looked ok..not, I've put so much gas down my carb I'm worried about my oil. EDIT;O.k I think I've removed my head from my ass now. Got her adjusted.
    Anal-cranal intercourse suks don't it!!!!!!!!!! I've suffered thru that a few times. M

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