weird holly issue
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weird holly issue

  1. #1
    Member aj06bolt12r's Avatar
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    Default weird holly issue

    The 1050 dominator on my 460 is acting up. It worked perfectly all last season. I rebuild it again this spring with a quick fuel rebuild kit, used the same jets and everything as last year.

    So far this year the engine starts good cold and will start good hot if you shut if off and then re start within a few seconds. But if you let it sit 5 minutes and try to start engine it will be very flooded. Plus the floats will be almost empty. The gas is draining out of the float bowls into the engine with the key and the fuel pump off. So you have to hold the throttle wide open and crank for a while to get engine re started. It also smells too rich at low rpm but runs great from 3700 to 5400 rpm. It will sit and idle for as long as necessary but smell rich.

    None of these things were happening last year so I know its not a jetting issue. The power valves are blocked off but I tried replacing the power valve gaskets again thinkng maybe the gas was leaking through there but that didnt change anything. Also verified that the bowl vents are not clogged by blowing through them wich resulted in gas spaying into the throttle bores.

    Im running a holley black fuel pump and a quick fuel bypass regulator with 1/2" id fuel line. Last year I had a holley blue with a dead head regulator and 3/8" line. I run about 6psi fuel pressure. 93 octane pump gas.

    Any ideas???
    '78 nordic bubble deck, berkm a imp, place diverter, 460 with ported doves and oversize stainless valves, custom flat hyd cam, 1050 dominator, ect...

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  3. #2
    Senior Member W.O.T's Avatar
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    Default

    Thats A Big Carb Does Your Motor Need It?

  4. #3
    Senior Member Schiada 201's Avatar
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    Sounds like the needle and seat are bad or adjusted the floats too high not allowing the fuel to stop flow.

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    Senior Member tkriley13's Avatar
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    Take it to C & J Engineering talk with Johnny. No more problems!!! I`m sure he can get more out of that carb than any of us... Just my 2 cents

  7. #5
    Member aj06bolt12r's Avatar
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    W.O.T
    Thats A Big Carb Does Your Motor Need It?
    I am sure I could have gotten away with a little smaller carb, but I got a good deal on this one and I Ive been told many times that jet boats like alot of carb.


    Schiada 201
    Sounds like the needle and seat are bad or adjusted the floats too high not allowing the fuel to stop flow.
    Floats are set with fuel level about 1/4 of the way up the clear sight glasses. I do not understand how a bad needle and seat could allow gas to enter the engine and drain the float bowls with the fuel pump off. The needle and seat control fuel flow from the fuel lines into the bowl correct? So if the needle and seat are bad it would cause the float bowls to over fill and then I would have a flooding problem with the engine running. This is not the case, my floats never get any higher than 1/4 up the sight glass.

    However I have had several others suggest to me to replace the needle and seat, so I will go try that, thank you.
    '78 nordic bubble deck, berkm a imp, place diverter, 460 with ported doves and oversize stainless valves, custom flat hyd cam, 1050 dominator, ect...

  8. #6
    Member aj06bolt12r's Avatar
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    Just went out and installed brand new needle and seat, still has exact same problem.
    '78 nordic bubble deck, berkm a imp, place diverter, 460 with ported doves and oversize stainless valves, custom flat hyd cam, 1050 dominator, ect...

  9. #7
    Senior Member SoldHondaBoughtHondo's Avatar
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    I don't think a float bowl can drain down the motor....unless it's a q-jet..lol

    maybe drip some from residual fuel pressure pushing past the needle/seat from heat soak.....

    I would probably run it, shut it down and see what's really going on....

    and a float bowel of fuel down the intake...it's would be so flooded you might not even get it started...be the same as pumping it to the floor half a dozen times....

    When in doubt, drop the float level...below the check hole if necessary. Shut it off and see if the fuel level rises after the motor/fuel pump are shut down....
    Are all 4 idle mix screws responsive?

    And you did make sure every air bleed was perfectly clean, right?
    Last edited by SoldHondaBoughtHondo; 06-27-2011 at 11:08 AM.
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  10. #8
    Boat Nut sleekcrafter's Avatar
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    Lower the float level to the bottom of the site glass, with the boat sitting as it would in the water.
    Upper Midwest Power Boat Association
    DRAG BOAT RACING UMPBA #926


  11. #9
    Member aj06bolt12r's Avatar
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    Quote Originally Posted by Sold honda.bought hondo View Post
    I don't think a float bowl can drain down the motor....unless it's a q-jet..lolmaybe drip some from residual fuel pressure pushing past the needle/seat from heat soak.....I would probably run it, shut it down and see what's really going on....and a float bowel of fuel down the intake...it's would be so flooded you might not even get it started...be the same as pumping it to the floor half a dozen times....When in doubt, drop the float level...below the check hole if necessary. Shut it off and see if the fuel level rises after the motor/fuel pump are shut down....Are all 4 idle mix screws responsive?And you did make sure every air bleed was perfectly clean, right?
    I assure you the float bowl can drain into the engine, I watched it happen today. It's only the primary side. I installed new needle and seat in both front and rear float bowls today. Set float level too low at first then moved them up to 1/4 up the sight glass again. As soon I turn off the fuel pump I can literally watch the float level in primary bowl drain out in a matter of about 30 seconds. The engine does not have to be warm for this to happen. But if the engine has just been running you can actually see smoke or steam rising out of the top of the carb as the gas drains into the intake and displaces the smoke.
    '78 nordic bubble deck, berkm a imp, place diverter, 460 with ported doves and oversize stainless valves, custom flat hyd cam, 1050 dominator, ect...

  12. #10
    Member aj06bolt12r's Avatar
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    Also every air bleed was removed and every passage in carb has had plenty of carb cleaner and compressed air run through it during rebuild right before the first time I took it out this year. There is no residual pressure in fuel lines, as soon as key is off pressure gauge hits zero.
    '78 nordic bubble deck, berkm a imp, place diverter, 460 with ported doves and oversize stainless valves, custom flat hyd cam, 1050 dominator, ect...

  13. #11
    Senior Member Widetrack's Avatar
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    Quote Originally Posted by aj06bolt12r View Post
    I assure you the float bowl can drain into the engine, I watched it happen today. It's only the primary side. I installed new needle and seat in both front and rear float bowls today. Set float level too low at first then moved them up to 1/4 up the sight glass again. As soon I turn off the fuel pump I can literally watch the float level in primary bowl drain out in a matter of about 30 seconds. The engine does not have to be warm for this to happen. But if the engine has just been running you can actually see smoke or steam rising out of the top of the carb as the gas drains into the intake and displaces the smoke.
    When rebuilding this carb did you remove the center squriters???


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  14. #12
    Senior Member Hass828's Avatar
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    Probably a metering plate gasket on that side. Or a warped metering plate. Try tightening the 4 bowl screws on that side and see if it helps. If it fixes it or makes it better then it needs to come apart for an inspection and a new gasket. JMO.
    "if we keep doing it the same way we always do..we will always get the same results"
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  15. #13
    Senior Member Widetrack's Avatar
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    Quote Originally Posted by Hass828 View Post
    Probably a metering plate gasket on that side. Or a warped metering plate. Try tightening the 4 bowl screws on that side and see if it helps. If it fixes it or makes it better then it needs to come apart for an inspection and a new gasket. JMO.
    Hass, wouldn't the plunger if removed or lost from under the center squriter make one bleed down some?

    If the gas is bleeding down looking down the carb and see where is it coming from!


    SOMEONE SAID YOU CAN'T TAKE IT WITH YOU! SO,IM BURNING IT UP ONE GALLON AT A TIME!
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  16. #14
    Senior Member Hass828's Avatar
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    Quote Originally Posted by Widetrack View Post
    Hass, wouldn't the plunger if removed or lost from under the center squriter make one bleed down some?

    If the gas is bleeding down looking down the carb and see where is it coming from!
    It would have to siphoning and I dont think it would do that as fast as he's saying the fuel level is leaking down into the intake.
    I have an almost new holley on an old 454 truck that does this same thing. I tightened up the bowl screws and temp. fixed it but need to get off my azz & put a new gasket in it and check my metering plate out.

    He does have his floates a little to high if the level can be seen through the clear sight plugs though. You should have to rock it around to see'em.
    Last edited by Hass828; 06-27-2011 at 03:26 PM.
    "if we keep doing it the same way we always do..we will always get the same results"
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