AFB Float Adjustment

Carter AFB Float Adjustment

Float Alignment

Look down the edge of the float to make sure it is parallel with the edge of the float bowl top.
To adjust, pull the end of the float one way or the other to make it parallel. Support the back of the float with your thumb as shown in the illustration.

Make sure the float doesn't bind when moving it up and down.


AFB Floats



AFB Float Level
Measure the float level with the float bowl gasket installed and the needle & seat installed. The gauge illustration is not available. Instead measure with a metal ruler. Use the setting printed in your carburetor kit instruction sheet.

Adjust by bending the float at the hinge as shown in the illustration.

NOTE: Do not put any pressure on the needle when adjusting the float. Any pressure can damage the tip, causing the needle & seat to leak.


















The float drop is important because when it drops the needle pulls out of the seat allowing fuel to enter.
Carter AFB or AVS Float Drop
 

Adjust by bending the tang in back of the float hinge. This tang will hit the seat stopping the drop.

The float drop setting is in your carburetor kit instruction sheet, but for the most part it can be any size, as long as the needle doesn't fall out, or cocks to one side. It also needs to drop enough to allow the needle to move out of the seat.

NOTE: Do not put any pressure on the needle. Doing so will damage the needle and you will get too much fuel into the bowl.

Carter AFB Float Setting
VEHICLE
YEAR
APPLICATION
FLOAT LEVEL
FLOAT DROP
4758S, 4759S
ALL
HP
5/16
7/16
, 4760S, 4761S, 4762S
ALL
HP
5/16
23/32
9000
ALL
HP
9/32
15/16
AMERICAN MOTORS
1967-69
290, 343
5/16
3/4
AMERICAN MOTORS
1968
BARRACUDA 273 W/C.A.P.
5/16
3/4
AMERICAN MOTORS
1968
BARRACUDA 273 WO/C.A.P.
7/32
3/4
BUICK
1957
 
7/32
23/32
BUICK
1958-60
 
7/32
23/32
BUICK
1961-63
364, 401, 425
7/32
3/4
BUICK
1961-65
DUAL CARBS
7/32
23/32
BUICK
1964-65
400, 401, 425
1/4
3/4
BUICK
1965
300
3/16
23/32
BUICK
1966
340, 400, 401
1 13/32
3/4
BUICK
1967
340
1 13/32
3/4
BUICK
1967
401
1 13/32
3/4
BUICK
1957
 
7/32
23/32
BUICK
1958-59
 
7/32
23/32
BUICK
1960
 
7/32
23/32
BUICK
1961-63
364, 401, 425
7/32
23/32
BUICK
1961-65
FRONT & REAR 425
1/4
3/4
BUICK
1965
300
3/16
23/32
BUICK
1966
340
1 13/32
3/4
BUICK
1966
401
1 15/32
3/4
BUICK
1967
340
1 13/32
3/4
CADILLAC
1957-60
ALL
5/16
23/32
CADILLAC
1961-66
ALL
3/8
15/16
CADILLAC
1957-60
 
5/16
23/32
CADILLAC
1961-65
 
3/8
15/16
CADILLAC
1966
 
3/8
15/16
CHEVROLET
1958-65
327, 348, 409
7/32
23/32
CHEVROLET
1958-61
348
7/32
23/32
CHEVROLET
1961-65
409 HP
7/32
23/32
CHEVROLET
1962-65
327 INC CORVETTE
7/32
23/32
CHEVROLET
1962-65
409 DUAL CARB
7/32
23/32
CHRIS CRAFT
1960-62
430
3/16
23/32
CHRYSLER
1957-62
 
7/32
23/32
CHRYSLER
1959-62
DUAL CARB FRONT
9/32
23/32
CHRYSLER
1959-62
DUAL CARB REAR
7/32
23/32
CHRYSLER
1959-62
 
7/32
23/32
CHRYSLER
1960-61
DUAL CARB
9/32
23/32
CHRYSLER
1963
383
7/32
3/4
CHRYSLER
1963
413
7/32
23/32
CHRYSLER
1963-64
413 DUAL CARB
9/32
23/32
CHRYSLER
1964
413 & CANADA 383
7/32
23/32
CHRYSLER
1965
IMPERIAL 413
7/32
3/4
CHRYSLER
1965-66
383, 413, 426, 440
7/32
3/4
CHRYSLER
1966
383, 440 W/C.A.P.
7/32
3/4
CHRYSLER
1966
426 FRONT
5/16
3/4
CHRYSLER
1966
426 REAR
7/32
3/4
CHRYSLER
1966
IMPERIAL 440
7/32
3/4
CHRYSLER
1966
IMPERIAL 440 W/C.A.P.
7/32
3/4
CHRYSLER
1967
383 W/C.A.P.
5/16
3/4
CHRYSLER
1967
383 WO/C.A.P.
5/16
3/4
CHRYSLER
1967
440 W/C.A.P.
5/16
3/4
CHRYSLER
1967
440 WO/C.A.P.
7/32
3/4
CHRYSLER
1967
IMPERIAL 440 W/C.A.P.
5/16
3/4
CHRYSLER MARINE
1961-65
M318, M383, M413
7/32
23/32
CHRYSLER MARINE
1965
M273B
7/32
23/32
DEARBORN MARINE
1961-64
289
3/16
3/4
DEARBORN MARINE
1961-64
390
3/16
23/32
DESOTO
1958-59
DUAL CARBS FRONT
9/32
23/32
DESOTO
1958-59
DUAL CARBS REAR
7/32
23/32
DESOTO
1958-61
 
7/32
23/32
DESOTO
1960-61
DUAL CARBS
9/32
23/32
DODGE
1958-59
DUAL CARBS FRONT
9/32
23/32
DODGE
1958-59
DUAL CARBS REAR
7/32
23/32
DODGE
1958-59
 
7/32
23/32
DODGE
1960
S/T
5/16
23/32
DODGE
1960-61
DUAL CARBS
9/32
23/32
DODGE
1960-61
LANCER 6 CYL
9/32
23/32
DODGE
1960-63
A/T & POLICE ST & AT
7/32
23/32
DODGE
1963
DUAL CARBS 413
9/32
23/32
DODGE
1964
DUAL CARBS 426
7/32
23/32
DODGE
1964
POLICE HP & CANADA
7/32
23/32
DODGE
1965-67
DART 273 WO/C.A.P.
7/32
3/4
DODGE
1965-66
383, 413, 426
7/32
3/4
DODGE
1965-66
DUAL CARBS 426
7/32
23/32
DODGE
1966
383 W/C.A.P.
7/32
3/4
DODGE
1966
DART 273 W/C.A.P.
7/32
3/4
DODGE
1967
383
5/16
3/4
DODGE
1967
426 DUAL 4324S FRONT
9/64
23/32
DODGE
1967
426 DUAL CARB WO/C.A.P. FRONT
5/16
3/4
DODGE
1967
426 DUAL CARB WO/C.A.P. REAR
7/32
3/4
DODGE
1967
440 W/C.A.P.
5/16
3/4
DODGE
1967
440 WO/C.A.P.
7/32
3/4
DODGE
1967
DART 273 W/C.A.P.
5/16
3/4
DODGE
1967
DART 273 WO/C.A.P.
7/32
3/4
DODGE
1967-68
426 DUAL CARB W/ C.A.P. FRONT
9/32
3/4
DODGE
1967-68
426 DUAL CARB W/C.A.P. REAR
7/32
3/4
DODGE
1969
426 DUAR CARB
7/32
3/4
DODGE TRUCK
1960-68
413
7/32
23/32
FORD
1957
312
5/32
23/32
FORD
1958
352
5/16
23/32
FORD
1959
430
3/16
23/32
FORD
1960
430
3/16
23/32
LINCOLN
1959-60
 
3/16
23/32
LINCOLN
1963-65
430
3/16
23/32
LINCOLN
1966
 
3/16
23/32
LINCOLN
1967-68
462
3/16
23/32
MERCURY
1957
 
5/32
23/32
MERCURY
1959-60
 
3/16
23/32
PLYMOUTH
1958
350 DUAL CARBS FRONT
9/32
23/32
PLYMOUTH
1958
350 DUAL CARBS REAR
7/32
23/32
PLYMOUTH
1958-59
 
9/32
23/32
PLYMOUTH
1960-61
VALIANT 6 CYL S/T
9/32
23/32
PLYMOUTH
1960-61
DUAL CARB
9/32
23/32
PLYMOUTH
1960-62
318, 361
7/32
23/32
PLYMOUTH
1963
383
7/32
23/32
PLYMOUTH
1963
413 DUAL CARB
9/32
23/32
PLYMOUTH
1964
426 DUAL CARB
7/32
23/32
PLYMOUTH
1964
POLICE HP
7/32
23/32
PLYMOUTH
1965-66
273
7/32
3/4
PLYMOUTH
1965-66
383, 413, 426
7/32
3/4
PLYMOUTH
1965-66
426 DUAL CARB
7/32
23/32
PLYMOUTH
1966
273 W/C.A.P.
7/32
3/4
PLYMOUTH
1966
383 W/C.A.P.
7/32
3/4
PLYMOUTH
1967
273 WO/C.A.P.
7/'32
3/4
PLYMOUTH
1967
383 W/C.A.P.
5/16
3/4
PLYMOUTH
1967
383 WO/C.A.P.
5/16
3/4
PLYMOUTH
1967
440 W/C.A.P.
5/16
3/4
PLYMOUTH
1967
440 WO/C.A.P.
7/32
3/4
PLYMOUTH
1967
426 DUAL CARB FRONT 4323S
9/64
23/32
PLYMOUTH
1967
426 DUAL FRONT
5/16
3/4
PLYMOUTH
1967
426 DUAL REAR WO/C.A.P.
7/32
3/4
PLYMOUTH
1967
BARRACUDA 273 WO/C.A.P.
7/32
3/4
PLYMOUTH
1967
BARRACUDA 273 W/C.A.P.
5/16
3/4
PLYMOUTH
1967-68
426 DUAL FRONT W/C.A.P.
9/32
3/4
PLYMOUTH
1967-68
426 DUAL REAR W/C.A.P.
7/32
3/4
PONTIAC
1961
TEMPEST 4 CYL
7/32
23/32
PONTIAC
1963-64
TEMPEST 326
11/32
23/32
PONTIAC
1965
TEMPEST 326 HO ST
13/32
23/32
PONTIAC
1965
TEMPEST 326 HO AT
11/32
23/32
PONTIAC
1965
TEMPEST, GTO 389 S/T
11/32
23/32
PONTIAC
1965
TEMPEST, GTO 389 A/T
9/32
23/32
PONTIAC
1966
TEMPEST 326 S/T
9/32
23/32
PONTIAC
1966
TEMPEST 326 A/T
13/32
23/32`
PONTIAC
1966
TEMPEST, GTO 389 S/T
11/32
23/32
PONTIAC
1966
TEMPEST,GTO A/T
9/32
23/32
PONTIAC
1967
TEMPEST, FIREBIRD 326 S/T
13/32
23/32
PONTIAC
1967
TEMPEST, FIREBIRD W/A.I.R. S/T & A/T
11/32
23/32
STUDEBAKER
1963
 
3/8
23/32
STUDEBAKER
1963
GRAN TURISMO
7/32
23/32
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