New Holley carb pump shot needle stuck

Fuel and Air Systems

  1. Sonny

    Sonny Well-Known Member

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    I took the nozzle off and when I hit the throttle very little fuel goes past the needle in the hole and the needle doesn’t move. Barely a dribble comes out. The pump arm is very tight and doesn’t move the pump arm. I’m assuming the needle is stuck in the hole. What’s the best way to dislodge? It’s a brand new Holley 770 cfm avenger.
     
  2. Sonny

    Sonny Well-Known Member

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    So the needle moves but it’s like the passage in the metering block is restricted. With the bowl off the pump squirts fine.
     
  3. 66Satellite47

    66Satellite47 FBBO Gold Member FBBO Gold Member

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    Wrong metering block gasket?
     
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    • RJRENTON

      RJRENTON FBBO Gold Member FBBO Gold Member

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      I concur....the accelerator pump passage is thru the center of the metering block gasket and thru the fuel bowl gasket....either gasket if it overhangs the passsges, the flow will be impeded. Just my opinion of course.
      BOB RENTON
       
    • Sonny

      Sonny Well-Known Member

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    • Sonny

      Sonny Well-Known Member

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      316B488B-EC87-485B-AE41-38DC5B69E628.jpeg 316B488B-EC87-485B-AE41-38DC5B69E628.jpeg Seemed to be clear.
       
    • Gpuller

      Gpuller Well-Known Member

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      Might want to pull the cover off the accelerator pump. Maybe there is something wrong with the diaphragm.
       
    • Sonny

      Sonny Well-Known Member

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      Nope. I removed the bowl and it shoots 10’.
      I already ordered another from summit.
       
    • coloradodave

      coloradodave FBBO Gold Member FBBO Gold Member

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      IMO, put it back together and return/exchange it for another. Why try to "fix' a NEW carburetor that you just bought?
       
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      • Woodruff Carbs

        Woodruff Carbs FBBO Vendor FBBO Sponsor

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        I can’t see the hole for the pump channel through the gasket in the picture. It looks out of line.
         
      • Daves69

        Daves69 Well-Known Member

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        I agree, it's hard to tell with that picture even blowing it up a bit.

        Yours on the left should look like the picture on the right Sonny..........
        upload_2020-2-15_8-37-25.png

        If the bowl gasket is right, maybe there's just a piece of gasket material under that shooter nozzle valve, or like said previously, the gasket behind the metering block is bad.
        upload_2020-2-15_8-48-20.png
         
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