Demon Fuel Systems 4402020VE - Manual (Page 7)

7
Vacuum Lines
All Road Demon
™ carburetors have three vacuum sources on the baseplate that can be used for
PCV, distributor vacuum, diagnostics, or any other vacuum operated accessories (Fig. 10). The large
fitting on the back of the baseplate, and the second fitting of the two small fittings on the side of the
baseplate, are direct (below the butterfly) manifold vacuum sources. The front small fitting on the side
of the baseplate, opposite the throttle linkage plate, provides a ported (above the butterfly) vacuum
source. Be sure all vacuum lines are connected or plugged before you attempt to start the engine.
Figure 10
Priming the Carburetor
Fill the bowl through each vent tube until fuel is visible in the sight window. Depress the accelerator
pump levers once or twice until fuel is discharged from the pump discharge nozzles. On vehicles
equipped with electric fuel pumps, bump the pump switch on and off to fill the bowls a little at a time.
Avoid an abrupt surge of fuel into an empty carburetor. This can damage the floats and cause
flooding.
Remember to check for leaks. The engine should now be ready to start with a minimal amount of cold
cranking.
Ladies and Gentlemen, Start Your Engines!
Get a helper. Unless your car can be started from the engine compartment, starting your engine for
the first time should always be performed with an assistant. A second set of eyes to watch for fuel
leaks can be invaluable. A generous amount of initial timing is also beneficial to ease starting. We find
18-24º of advance suitable for most performance applications.
Before engaging the ignition, depress the throttle fully and release once or twice. Now, attempt to
start the engine. If the engine does not fire under reasonable cranking, stop cranking and repeat the