What Causes a Holley 1920 Carburetor to Flood?

  1. Faulty Float Valve, or Needle & Seat: The float valve controls the flow of fuel into the carburetor bowl. If it's not sealing properly, it can allow too much fuel to enter the bowl, leading to flooding. Check the float valve for wear, damage, or debris that might be preventing it from closing properly. Turn the carburetor upside down and blow into the inlet. With about 4 lbs air should not get through.

  2. Incorrect Float Level: If the float level is set too high, it can cause excessive fuel to enter the carburetor bowl, leading to flooding. Ensure that the float level is set to the manufacturer's specifications. In this case the carburetor probably not running correctly under any condition.

  3. Stuck Choke: A stuck choke can keep the choke plate partially closed even when the engine is warm, causing an overly rich air-fuel mixture and flooding. Make sure the choke is operating correctly and fully opening when the engine is warm.

  4. High Fuel Pressure: Excessive fuel pressure from the fuel pump can overwhelm the carburetor's needle and seat, causing flooding. Ensure that the fuel pressure is within the recommended range for the Holley 1920 carburetor. About 4 lbs.

  5. Clogged Jets or Passages: Dirt, debris, or varnish buildup in the carburetor jets or passages can disrupt the proper flow of fuel and air, causing flooding. Clean the carburetor thoroughly to remove any obstructions.

  6. Worn or Damaged Gaskets: Gaskets and seals in the carburetor can deteriorate over time, leading to fuel leaks and flooding. Inspect the gaskets and seals for signs of wear or damage and replace them if necessary.

  7. Excessive Fuel Pressure Regulator Setting: If your vehicle has a fuel pressure regulator, ensure that it is set to the correct pressure. If it's set too high, it can cause excessive fuel pressure and flooding.

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