Join Date: Dec 2001
Location: Latonia Kentucky
Sounds like dirt on the needle and seat, causing the secondary fuel bowl to overflow into the throttle bores. Fairly common problem with a Holley carb. Take a screwdriver handle and rap on the top of the valve (the large head screw with a nut under it on top of the fuel bowl) a few times. Sometimes this will dislodge whatever is in the valve.
If that doesn't work, you'll need to remove the valve and blow it out. To do this, place a 5/8" wrench on the nut and hold it stationary. Then remove the large screw. Pull the nut off and note the height of the brass valve body above the fuel bowl. Reinstall the nut and turn counter-clockwise to remove the valve. After cleaning the valve, reinstall it to the same height that it was. Put the nut on, hold it with the wrench, and reinstall the screw and tighten it (don't forget the gaskets between the bowl and nut, and nut and screw). Start the car, and remove the sight plug from the side of the bowl. The fuel level should be at the bottom of the sighy plug hole. To adjust up or down, loosen the screw (engine off) and turn the adjusting nut clockwise to lower the fuel level, or counterclockwise to raise it.