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Stromberg BXVD Troubleshooting

Check ball location

This carburetor had a ball fall out while I was taking it apart as a resort I am not sure were it came out of. The acceleration pump is putting fuel out of the hole on the left side of the main body, only when you push on the gas petal. However while its idling its spraying fuel out of the center of the main body which I think is the main discharge jet comes up. So I am not sure where the ball goes. I looked at two different pictures and read how to tear it apart in my 1952 repair materiel and can’t find anything about the ball. I hope you can help me.

IIRC the BXV pump valves are both unitized: the intake valve is a ball crimped into a brass seat which inserts at an angle from the lower front of the bowl and the discharge check valve looks like a Stromberg power valve with a recessed “stem” and locates in the bottom of the pump well. I know of no loose balls in those carbs; perhaps someone who did not know what they were doing previously worked on the carb.


Flooding means gas is flowing out of the carburetor somewhere. The float bowl is getting over full, so the gas goes anywhere it can, usually out the top. You might even notice gas coming out of the throttle shaft.

Some things that will cause flooding.

  • Dirty, or damaged needle & seat. See here for how to test the needle & seat.
  • Float is leaking. Do you hear fuel when shaking. Heat a pan of water just prior to boiling and immerse the float. Any bubbles indicate a leak.
  • Is the float rubbing on the sides?
  • Pull the float up and down to see if there is any resistance. The float pin may be worn.
  • Test the fuel pump pressure (especially on a new pump) to see if the pressure is over 4 lbs. See your motors manual for the exact pressure.

Does your vehicle sit for extended periods of time?

Ethanol Defense

Updated on 12/14/2020

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