Author Topic: Boss 351 carb float level  (Read 522 times)

Offline Stillakid54

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Boss 351 carb float level
« on: August 07, 2016, 11:37:41 AM »
I am trying to reset the float level for my Autolite 4300-d carb. No success so far on the boss forum or internet scouring +++. Could anyone help me with these values? Thanks in advance.

Offline WT8095

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  • Dave Z.
Re: Boss 351 carb float level
« Reply #1 on: August 07, 2016, 02:12:41 PM »
Do you have a copy of the shop manual?
Dave Z.

'68 fastback, S-code + C6. Special Paint (Rainbow promotion), DSO 710784. Actual build date 2/7/1968, San Jose.
'69 Cougar convertible, 351W-2V + FMX, Meadowlark Yellow.

Offline Stillakid54

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Boss 351 carb float level
« Reply #2 on: August 07, 2016, 06:40:42 PM »
I have a complete (?) 71 mustang one, I think four volumes, but interestingly the 4300-d is not covered in the carb section...rats.

Offline Murf

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Re: Boss 351 carb float level
« Reply #3 on: August 07, 2016, 11:14:20 PM »
The 4300 requires a simple tool be fabricated to check the level of the "pontoon" type of floats, and most applications are 13/16 in my experience.  Do you have the secondary needle and seat in yours?  If so there are two float levels to set. 
John Murphy

1965 "K" GT fastback Honey Gold exterior, Ivy Green and White Pony interior, many options
1966 Conv., high option, removeable hardtop, thermactor "C" engine, AC, Springtime Yellow exterior, Black Pony interior
1968 California Special, "J" code, ,many options, white with red interior

Offline J_Speegle

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Re: Boss 351 carb float level
« Reply #4 on: August 07, 2016, 11:44:24 PM »
To help illustrate how its adjusted (from a 68 TSB) Unfortunately don't have the specifications for a 71





Jeff Speegle

Anything worth doing is worth doing concours ;)

Offline Murf

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Re: Boss 351 carb float level
« Reply #5 on: August 08, 2016, 10:42:37 AM »
Normally the float settings along with other important specs are included with a rebuild kit. 
John Murphy

1965 "K" GT fastback Honey Gold exterior, Ivy Green and White Pony interior, many options
1966 Conv., high option, removeable hardtop, thermactor "C" engine, AC, Springtime Yellow exterior, Black Pony interior
1968 California Special, "J" code, ,many options, white with red interior

Offline Stillakid54

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Re: Boss 351 carb float level
« Reply #6 on: August 08, 2016, 05:54:51 PM »
Unfortunately not for the 4300-D