Model B

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Zenith Carburetor Float Valve Orifice Details

Model B Zenith carburetors used the B-9564 fuel float level needle valve. Each original float valve was marked with a number to designate the orifice size. The standard Model B valve was a '44'.

The original Ford / Zenith carburetor valve number found stamped on the valve is the orifice size as expressed in 0.05 mm increments. For example, a valve marked number '44' has an orifice diameter of (44)*(0.05) = 2.2 mm = 0.0866 inches.

Zenith made a whole series of carburetors based on the Model B designs and component sets for other manufacturers, and there are a variety of valves found which look similar but which are not the correct size for the Model B.

The table below shows the orifice sizes for various original Zenith valves encountered, as well as some replacement valves. Beware of using valves with too small opening sizes.

The correct size valve when used with a fuel pump is a '44', while the '54' is correct for gravity fed carburetors. Significantly different valve sizes may cause fuel delivery problems.

Model B Zenith Carburetor ~ Valve Orifice Sizes

B-9564 Float Valve Number
Orifice Diameter
Zenith -
Standard Model B
with fuel pump
44 0.0866
Zenith - other 45 0.0886
Zenith -
For use on Model A
with gravity feed
54 0.1063
Zenith - other 55 0.1093
Stipe - ball type ~ 0.0955

More related information on Ford Garage:

  1. For more Model A & B related information, use the Site Search box at the top or bottom of this page.
  2. Model A & B Zenith Carburetor Jet Sizes & Flow Rates
  3. Model B & 46 Zenith Carburetor Parts Catalog Illustrations
  4. Model B & 46 Zenith Carburetor Assembly Drawings
  5. Model B & 46 Zenith Carburetor Float Details
  6. Model B & 46 Zenith Carburetor Power Jet Circuit
  7. Model B & 46 Zenith Carburetor Power Jet Tube
  8. Model B & 46 Zenith Carburetor Power Jet Tube Instructions
  9. Model B & 46 Zenith Carburetor Catalog Data
  10. Model B & 46 NOS Zenith Carburetor
  11. Model B & 46 Zenith Carburetor Upper Casting Variations

July 2015