fuel flow from the secondary nozzles in direct proportion
to air flowing through the secondary bores.
float bowl is centrally located to avoid problems of fuel
spillage causing engine turn cutout and delayed fuel flow
to the carburetor bores. The float bowl reservoir is small in design
to reduce fuel evaporation loss during engine "shutdown"
float system has a single pontoon float and fuel valve
for simplification and ease in servicing. An integral fuel
filter, if used, located in the float bowl ahead of the float
needle valve, is easily removed for cleaning or replacement.
throttle body is aluminum to reduce overall weight and
improve heat conduction to prevent icing. A heat insulator gasket
is used between the throttle body and bowl to prevent fuel percolation in
the float bowl.
Quadrajet applications use a shim between the throttle
body and flange gasket. The shim is used to protect the carburetor aluminum
throttle body from exhaust gases flowing
through the heat cross-over passage in the intake manifold.
primary side of the carburetor has six operating systems.
They are float, idle, main metering, power, pump and
choke. The secondary side has one main metering system
plus accelerating wells on some models. All metering systems receive
fuel from the one float chamber.
following text covers the operating systems for ease in
trouble-shooting and also recommended service procedures.
There are some design variations between different