Help with Holley G carb ?

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Model T Ford Forum: Forum 2017: Help with Holley G carb ?
Top of pagePrevious messageNext messageBottom of page Link to this message  By Rich Bingham on Sunday, February 12, 2017 - 12:07 pm:

Got my MTFCA carb manual, it's great !!

Question though, on page 11, picture #30 shows a diagram and information on setting the proper float height. The image is blurry and hard to read, and appears to be incomplete, having been clipped from source material.

Using the jig that's illustrated for setting the float level out of the car with the spray nozzle top off the carb, the manual is vague about a "puddle" just covering the spray nozzle plate - it seems to indicate the level of fuel at that point should be 1/16" deep ? Is this correct ? would this be just enough fuel to touch the intake opening of the low speed tube ??

Also, a clear image of the source of Picture #30 would be very helpful if anyone knows where that might be found.

Thank you for your help.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Stan Howe Helena, Montana on Sunday, February 12, 2017 - 02:21 pm:

When you have the carb apart make sure that the overflow tube that also set in the recess below the venturi is intact. It should set roughly 1/8 of an inch above the surface it comes up through. Many have been damaged oor have been either pinched or soldered shut in an effort to stop the carb from leaking.

Then set the float so the fuel level is just slightly above the bottom of the depression in the removable spray nozzle plate. It will start well there and hold extra fuel in that area when it is choked to help keep it running when cold. The fuel level needs to cover the bottom of the idle pickup tube.

That fuel overflow tube also acts as an air bleed to help draw fuel into the air stream when the choke is closed for better starting. It is where it is for a reason. Do not drill it out larger but make sure it is open and clean.

It also bleeds during running but is so small it does not affect it as much when the engine is running.

Bear in mind that the new needles and seats that most vendors sell will not shut the fuel off and hold the correct level in the bowl without work on the tip.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Rich Bingham on Sunday, February 12, 2017 - 06:35 pm:

Stan, that clears up my questions. Thank you VERY much !


Top of pagePrevious messageNext messageBottom of page Link to this message  By bob middleton on Sunday, February 12, 2017 - 10:18 pm:

Only seen one tube in a G carb that's the one sits over the venture


Top of pagePrevious messageNext messageBottom of page Link to this message  By Stan Howe Helena, Montana on Monday, February 13, 2017 - 01:16 am:

Upper end of the overflow/air bleed tube:



This should extend about 1/16-1/8 inch above the surface.

Lower end of the overflow/air bleed tube:




The upper end of the air bleed tube cannot be seen with the venturi in place.



Restored Holley G: The first version of the G used the round brass adjuster, the later brass version used the flat brass adjuster and the cast iron version used the flat steel adjuster.










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