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Thread: Accelerator Pump Parts Squirter Nozzle

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  1. #1

    Default Accelerator Pump Parts Squirter Nozzle

    I'm trying to use a 3310-2 750 vacuum secondary on a street engine. No matter what, I can't get a pump shot. After watching the videos and adjusting the pump arm, verifying fuel pressure, and float levels, no pump shot. Taking the front bowl and metering block off, I believe I installed the gasket backwards which I think blocked off the passage. Anyway, I pulled the squirter/nozzle off and according to the part schematic, there's supposed to be a ball weight under the nozzle? There was none. Is it necessary? Thanks, Chad

  2. #2

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    It functions as a check ball assembly to stop any siphon affect. You should be able to manually pump the accelerator pump arm, and watch fuel squirt. If not, you got the gasket in wrong, or the diaphragm in the pump assembly is messed up.

  3. #3
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    In older carbs, they used a check ball under the pump diaphragm. In newer ones, they used a rubber umbrella to stop the fuel from pushing back up into the fuel bowl, when the accelerator pump is depressed.

    Click image for larger version. 

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  4. #4

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    Tonight, I pulled the carb again. Replaced the pump diaphragm, replaced the meter block gasket installing it correctly, double checked pump arm adjustment, installed check needle under nozzle, reviewed float levels, verified fuel pressure @ 6 psi.

    No pump shot. Have to pour a few ounces of gas to cold start the car. Once running and warmed up, I can drive the car, as long as I don't need to accelerate hard. If I try to accelerate, it bogs/wants to die. Drove a few miles to a gas station, filled up, and the car started up and drove home. Still no pump shot.

    This is the type of accelerator pump a 750/3310-2 has, there is no check ball. What else can I check?


  5. #5

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    You can start by taking the bowl off. Since it just had gas in the assembly, move the actuator arm. Is fuel squirting out? If not, it's in the bowl/actuator assembly. If it squirts gas, take the metering plate, line it up on the bowl, actuate the arm. Did fuel squirt through the metering block? If not, some blockage in the metering plate. If so, then has to be something in the carb body.

  6. #6

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    Quote Originally Posted by 69cam View Post
    You can start by taking the bowl off. Since it just had gas in the assembly, move the actuator arm. Is fuel squirting out? If not, it's in the bowl/actuator assembly. If it squirts gas, take the metering plate, line it up on the bowl, actuate the arm. Did fuel squirt through the metering block? If not, some blockage in the metering plate. If so, then has to be something in the carb body.
    So I spent some time (5 min) downloading picture to show you what to look for:
    Click image for larger version. 

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    Above is a Holley fuel bowl from a 4150 style carb. Yours may be a little different but you can see the small hole in the bottom left corner of the bowl, The accelerator pump pushes fuel through this hole when the lever is depressed. Get this working first. Blow through passage, manually put some fuel in the diaphragm area to make sure it has fuel and pump it to see if fuel squirts out this hole. If not, something wrong with accelerator pump assembly passage etc etc.
    Click image for larger version. 

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    The above picture is a Holley metering block. In the bottom right corner you will see a hole that lines up with the hole on the bowl for the accelerator pump. Get some wd40 and use the red nozzle to blow some WD40 through metering block. You can see in the picture that passage travel up in a diagonal passage to the center of the metering block and comes out on the other side. Make sure this is flowing.

    Click image for larger version. 

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    The above pic here is the main body of the of the carb. Right in the center of the block is hole "D". hard to see the letter but its the only hole in the center of the block. That hole leads directly to the discharge nozzle. Again, blow some wd40 through here and see if it will discharge out of the nozzle.

    Click image for larger version. 

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    The above pic is a cutaway of the bowl & metering block, that shows the entire path of fuel from accelerator pump all the way to the nozzle.

    You should be able to find your problem and address it from here.

    Thanks, Sean
    Last edited by 69cam; 06-25-2015 at 12:44 PM.

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