Check ball

Discussion in 'The Venerable Q-Jet' started by bherbert, Feb 11, 2018.

  1. bherbert

    bherbert Well-Known Member

    I installed an electric choke kit on my GS 350 4V.

    I saw a little ball on the workbench, and didn't know where it came from and properly lost it. I'm wondering if that's the check ball for the accelerator pump.

    Car won't start and battery is dying. Would this little ball prevent the car from starting and how concerned should I be about losing it? I have no idea where it came from.

    Any help is appreciated.

  2. carmantx

    carmantx Never Surrender

    Did you disassemble the entire carb?
    There is a checkball under the retainer screw. It is designed to keep the fuel in the accelerator pump circuit so it doesn’t drain down.
    It should still start and run without the ball, but it would be best to add it.
  3. bherbert

    bherbert Well-Known Member

    I re-jetted it, so yes it was slightly disassembled.

    The ball is gone - what size is it and what material? Lead, Aluminum, steel?

    Thanks for our help.

  4. carmantx

    carmantx Never Surrender

  5. bherbert

    bherbert Well-Known Member

    Can I order more than 1? What size are they?

    Thanks mark.

  6. carmantx

    carmantx Never Surrender

    Order all you need!
  7. bherbert

    bherbert Well-Known Member

    Done - I did 4. I'm sure I'll drop one of those buggers.

    Now, all I have to do is figure out where it goes. I have no clue.

  8. TrunkMonkey

    TrunkMonkey Well-Known Member


    It does not go in the intake manifold.

    I learned that back in nineteen aught and seventy nine...

    (except it was a small washer, not a big ass ball bearing)
  9. carmantx

    carmantx Never Surrender

    E1BB36B9-8250-4526-8B3F-D0931DF9587B.jpeg 305B5AD3-6ED6-472C-A172-BE165182A641.jpeg A92B6771-33CB-4E1F-B001-190DF7B25E19.jpeg Here are some pictures.
  10. bherbert

    bherbert Well-Known Member

    Ugh...I'm not an expert carb guy so I'll try my best.

  11. HotRodRivi

    HotRodRivi Tomahawks sighted overseas

    thats a pretty mild jet num there 70 Mark
  12. lemmy-67

    lemmy-67 Gold Level Contributor

    That little check ball is for the accelerator pump. If it's not there, the pump won't push fuel and will likely cause flow problems.

    When rebuilding, it is suggested after cleaning the float bowl to take the old ball, drop it in the hole and give it a gentle tap with a punch & ball-peen hammer to make a new seat in the carb body. Then remove the old ball & discard, replace with shiny new ball, replace retainer screw, and you're good to go.
  13. HotRodRivi

    HotRodRivi Tomahawks sighted overseas

    Mmmmm peening tecnique on the check ball hole, I like it.

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