Early Quadrajet carburetors (Figure 3) have the model number identification stamped on a circular tag pressed into a recess on the float bowl casting in a flat area on the throttle lever side.  Later model Quadrajet

carburetors have no tag but include the part number stamped vertically on the left rear corner of the float bowl casting adjacent to the secondary pick-up lever (Figure 4).  If replacing the float bowl, follow the manufacturer’s instructions contained in the service package so that the identification number can be transferred to the new float bowl.  Refer to the part number on the bowl when servicing the carburetor.

                                                                         SERVICE FEATURES

The primary side of the carburetor has six operating systems.  They are float, idle, main metering, power, pump, and choke.  All systems receive fuel from one fuel chamber.

The following text covers the operating systems for ease in trouble-shooting and also recommended service procedures.  There are some design variations between different models which will be covered in that part of the text pertaining to that particular system or service procedure.