Carb help!!!
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Carb help!!!

  1. #1
    Senior Member wajetboy's Avatar
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    Default Carb help!!!

    i am having some trouble with my carb its a 1050 dominator 3-circuit 9375. i put a new scoop on and it went lean to be expected but i have gone up 10 jet sizes from 89's to 99's and i am still lean, i am running 59 idle 78 intermediate 34 main for air bleeds. fuel pressure is good. what do you guys think? do i just need more jet? motor is a 521 ford, victor intake, 9 to 1 comp. eldbrock 100cc heads. cam .682 lift
    Last edited by wajetboy; 07-09-2008 at 07:03 AM.
    1978 Southwind Tunnel Dragster/1980 SWTD center steer

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  3. #2
    CarbGuy RumRunner's Avatar
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    Did this carburetor work fine before changing the scoop?

    Did you change anything else at all?

    Have you flow tested your fuel system to make sure it is flowing properly? Pressure and volume are different. You can have proper pressure, without enough volume.

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    Senior Member wajetboy's Avatar
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    with the air cleaner it had before plugs looked good. yes the scoop is the only thing that i changed. i should be getting enough fuel when i shut off at after a run ( high speed shut down) the bowls are still full.
    1978 Southwind Tunnel Dragster/1980 SWTD center steer

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  6. #4
    steelcomp was here
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    Take the scoop off
    If God is your co-pilot, change seats!
    Acts 2:38, the perfect answer to the perfect question.

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    CarbGuy RumRunner's Avatar
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    Quote Originally Posted by wajetboy View Post
    with the air cleaner it had before plugs looked good. yes the scoop is the only thing that i changed. i should be getting enough fuel when i shut off at after a run ( high speed shut down) the bowls are still full.
    There may be some sort of turbulence in your scoop.

    Are you using an air cleaner inside of it?

    Just because the bowls are full after you shut off (and they have time to fill up) doesn't mean you pump is or is not keeping up with the demand of your engine. You have to flow test it.

  8. #6
    gn7
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    Quote Originally Posted by steelcomp View Post
    Take the scoop off
    That, or make absolutely certain the NEW scoop isn't too close the vent tubes. You need at least 3/4 inch above the vent tubes to maintain atmospheric pressure in the bowls.



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  9. #7
    Senior Member wajetboy's Avatar
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    RumRunner, im not running an air cleaner in the scoop.

    gn7, which part of the scoop needs to be above the vent tubes?
    1978 Southwind Tunnel Dragster/1980 SWTD center steer

  10. #8
    Senior Member wajetboy's Avatar
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    rumrunner also how do i flow test my fuel system?
    1978 Southwind Tunnel Dragster/1980 SWTD center steer

  11. #9
    gn7
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    let me clearify. there needs to be 3/4" clearance above the vent tubes. If any part of the scoop comes within 3/4" of the top of the tube openings, fix it. Is the scoop facing foward? If so, try it backwards. If the problem goes away, you have one bad ass turbulence problem, and should prolly junk the scoop.



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  12. #10
    CarbGuy RumRunner's Avatar
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    What type of scoop are you running? (any pictures)

    The best bet on flowing the pump is to check with your pump manufacture to see how they want it tested to make sure it is flowing up to par.

  13. #11
    Senior Member wajetboy's Avatar
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    here is a picture of the scoop

    1978 Southwind Tunnel Dragster/1980 SWTD center steer

  14. #12
    CarbGuy RumRunner's Avatar
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    I would first make a pass without it and see if everything goes back to normal. Then I'd install an air cleaner inside to straighten the air out.
    Last edited by RumRunner; 07-15-2008 at 04:52 AM.

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    Are you running a return fuel system? Lean plugs sound like heat or turblance as mentioned before. There are many other things related to your problem,such as fuel pressure and the quanity of fuel, meaning flow. Looking at your picture of horses.

  16. #14
    cfm
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    I'll add my input without knowing the low down on these carbs:

    1) Listen/follow/ask for any advice Rumrunner offers up on carb subjects

    2) Although about cars, here is a thread on 9375's : http://speedtalk.com/forum/viewtopic.php?t=11706

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