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 Motorcraft 4300?? 
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Joined: Thu Mar 28, 2013 6:09 am
Posts: 726
I need to know how to set this float as it's got 2 needle and seats..Also anyone has any tips
on set up? Thanks
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Last edited by barryh on Wed May 20, 2015 7:08 am, edited 1 time in total.



Wed May 20, 2015 6:10 am
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Joined: Mon Dec 29, 2014 1:26 am
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Manual located here: http://www.carburetor-blog.com/autolite ... arburetor/

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Wed May 20, 2015 6:47 am
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Well I got the float today and it's got a screw in each end of the float.
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Thu May 21, 2015 5:57 am
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http://www.carburetor-parts.com/Motorcr ... _2613.html
"This version does not have screw in the toes as does our other 4300 float. This one matches the original float that was produced."

http://www.carburetor-parts.com/Ford-Mo ... _p_26.html
"This is a retrofit float and may not look exactly like your original float. These are heavier than the original, but they have a different buoyancy. You may have to adjust your float 1/8" lower, but we have used them with no change."

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Thu May 21, 2015 6:37 am
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Yea i seen that but both are not in stock and he didn't know if they will ever be in.
So I got what he had


Thu May 21, 2015 3:45 pm
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All it means is that the new float is heavier in total dead weight after the screws are added, but the leverage applied at the needle will be the same since the two floats are different shapes. I assume the new float has more floaty bits out at the ends than the original where it would have the most influence.

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Thu May 21, 2015 4:36 pm
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Not sure I see the reasoning for the weight. Poking a hole in the float is bad enough, doing it with the screw and leaving it there is adding insult to injury. I would remove the screw unless the float has so much buoyancy it won't let the float level (liquid level) be high enough ... fat chance of that.

In the '70s when the problems of the gasoline chemistry attacking the fuel system materials occurred there was a situation of a float shortage for several types of carbs, including this 4300, so replacement was impossible sometimes and a heavy float had to be used by setting the mechanical level "lower" in an attempt to have a normal liquid level. With these 4300 carbs a little bit of extra weight in the float made them troublesome with stalling at sudden stops. One guy had a 460 in a pickup truck (with a heavy float set low to get by until we got a new one) that would stall when going slow in potholes in his dirt driveway but other than that it ran OK. A new float fixed it.

It makes no sense to me to add mass, so more inertia, to a float.

There was a different float assembly for police cars with separate left and right pontoons so the g force of cornering wasn't so much of a problem.


Thu May 21, 2015 5:27 pm
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I knew I had one of these hidden somewhere, but didn't want to say anything until I found it. If you can use it it's yours. It does have 2 or 3 small nicks/scrapes that would probably need a smear of JBWeld to seal up.

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Thu May 21, 2015 7:49 pm
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Not sure that late float will fit the early carb.


Thu May 21, 2015 10:15 pm
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Thanks for all the help guys but what height di I set the float at??


Fri May 22, 2015 6:54 am
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