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how do adjust the middle screw the float adjustment on the front of a quadrajet carbuerator?
I have two great illustrated books, written by the late Doug Roe concerning Quadrajet carburetors. *There are no external float adjustments for these carburetors. The complete top must be removed and the hinge an float will be exposed. Depth mikes or a six inch gratuated steel ruler can be used to measure the far tip of the float against another flat piece of steel laying across the top of the exposed float bowl. There is a chart in these books that suggest different float levels *according to the size of the needle and center hole of the seat. The float is adjusted by carefully bending both tangs at the thinnest point equally that run out of the float. *If you have a .110 fuel inlet at the needle and seat the float should be set @ .160 plus or minus .010 at the upper rear toe of the float. If the fuel inlet is .125 the float should be set @ .265 plus or minus .010 at the toe of the float. The largest fuel inlet is .135 in which case the float should be set @ .296 plus or minus .010. If you're fussy, check the hole size of the inlet seat with a box of small number drills using the tail end not the drill end.
I wish I could actually see the carbuerator you have because it sounds more like a Holley with center-hung float bowls. These are simple to adjust. #1. With the hood up on the opposite side of the throttle lever (left) there is a *sight screw on the side of the float bowl right beside where the fuel line attaches. With the car running on a perfectly level surface, remove the site screw, don't drop the gasket and you'll see gasoline in the float bowl. The correct float level will be explained so that gasoline just barely leaks past the threads of the site screw hole.
To set the float level *crack loose the large slotted round jam screw on the top of the float bowl. Change the float level, use a 5/8 box end wrench to carefely and slowly turn the hex right or left to raise or lower the gas level in the float bowl. When fuel just seeps past the threads on the sight hole tighten the large round slotted screw ontop of the float bowl.
Check to see if it says Holley on the float bowl casting where the fuel line goes in.
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