Manual

2
Once a Demon™ carburetor is in place and the engine is running, the level should be set such that it
is in the middle of the sight window. Again, adjust the idle mixture screws to provide the highest
manifold vacuum or engine RPM.
Once a HOLLEY® carburetor is in place and the engine is running, the level should be set so that fuel
is just below the inspection hole and the mixture screws should be adjusted to provide the highest
manifold vacuum reading or engine RPM.
1. Remove the primary fuel bowl. Four screws, located at each corner of the bowl (Fig. 1), hold both
it and the metering block in place. When either one of the lower screws is loosened, fuel will begin
seeping out, unless the carb has been drained. If the carburetor has been in service for some
time, the screw gasket will tend to stick to the fuel bowl.
Figure 1
2. Once all four screws are removed, the bowl can be pulled away from the metering block.
Depending upon the age of the carburetor, this may not be quite as easy as it seems. Some
carburetors are assembled with composition gaskets and some were coated with a sealing resin
to eliminate fuel vapor seepage. A gentle pry with a wide blade screwdriver should solve the
problem. The same technique must also be applied to the metering block in order to separate it
from the main body. Demon Carburetion™ Model 4160 Road Demon Jr. has 2 external o-rings
visible when transfer tube is removed (Fig. 2). When the fuel bowl is pulled from a carburetor with
a single fuel inlet, the "O"-ring that seals the fuel transfer tube will generally remain inside the
housing (Fig. 3 refers to Holley ® Model 4160 ™). It should be pulled out and discarded at this
point, so that it doesn't become mixed with the new rings. The inlet fitting may be removed with an
11/16” wrench.
Figure 2 Figure 3