Autolite 4300 & 4350 Float

Autolite 4300 Float

The Motorcraft 4300 float is a Nitrophyl type of float. These are solid floats but it is possible for these to absorb fuel over time.

Autolite 4300
When installing your float be sure to center each pontoon over the bowl so that they don’t rub the side of the carburetor. Both pontoons should be the same height.
Measure the float level as shown in the illustration. With the top upside down, measure from the gasket to the top of the float (technically the bottom). Different applications have different measurements. If you can’t find the measurement set it to 13/16″.
There is not float drop setting necessary.
There were some aftermarket brass floats used, but we seldom if ever see these.


Weigh your old float using a gram scale. 15 grams is the perfect weight for the 4300. a gram or two either way would be OK.


It is easy to get the 4300 & the 4350 floats mixed up, but they have distinct differences.


Autolite 4300 Float


4300 Float4300 float – 15 grams

4350 Float4350 float – 14.5 grams

Autolite 4300 Carburetor Parts
Updated on 10/02/2021

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