Tuning Made Easy by Michael Hass

Author:Michael Hass
Language: eng
Format: epub
ISBN: 9788771886696
Publisher: Books on Demand

-Tuning the float level

As mentioned above, this is simple in the sense that there’s only one correct setting, meaning there is no tuning and testing, no trial and error you have to go through. For some carburetors you have to take the top off and measure the distance from the float to the top edge, and to be able to do that you of course have to know what number to aim for. That measurement can be hard to find with regards to an old carburetor, but if you buy a rebuilding kit, often instructions with the specified float height for each carb model will be included in the package. You’ll need that kit anyway, because you’ll need new gaskets, and on an old carb, you may soon find that you need many of the parts in such a kit.

On Holleys this adjustment is very easy as it can be done without dismantling the carburetor. With the engine idling, take out the sight plug on the side of the fuel bowl. Be ready with a rag to catch the fuel that might run out if the float level is too high. With the sight plug removed, use a big screwdriver and a 5/8” wrench to adjust. The screw should just be loosened slightly; adjustment is done with the nut. Adjust so that the fuel is up to the level of the sight plug hole and just slowly trickles out. Turning the nut counter-clockwise raises the fuel level. Note that if the level is too high and you adjust the float down, you have to wait until the fuel is consumed or has trickled out, which can be an issue especially on the secondary fuel bowl. You may need to open the throttle a little bit, and then with your other hand twist the secondary throttle axle so the secondary system consumes fuel. Also note that if you adjust the float down too low, the nut loses its grip on the float bolt, and when you try to get it back up by turning the nut counter-clockwise, it’ll have no effect. In that situation, stop the engine, remove the screw and nut entirely and screw the float bolt up with your fingers. You may need a new gasket after doing this. Attach nut and screw and start over.

When both floats are adjusted as specified above, install the sight plugs. Holley sells plastic ‘see-through’ sight plugs, but they are to be used with caution. It’s almost impossible to accurately gauge the fuel level through the thick plastic, and after years of exposure to engine heat, they can become brittle and fail. This can lead to fuel leaking out of the carburetor, which is a big fire hazard. Given that you rarely have to adjust the float level, just stick with the conventional removable plug.

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