For 1990-2009 cars

# NEW FLOAT LEVEL GAGE CARBURETOR INFORMATION

#### VEHICLES AFFECTED: All Vehicles Equipped With Dualjet or Quadrajet Carburetors

New External Float Level Gauges are available for checking the float level in all current Quadrajet and Dualjet carburetors, as shown in Figure 1.

The new gauge, Part Number J-34935-1, or BT-8420A reflects the design variables of the past several years that may have led to occasional inconsistent readings when the older gauge was used. The new gauge is also suitable for checking the float level of all past model Quadrajet and Dualjet models, and in checking Mixture Control Solenoid Plunger travel.

The procedure for external checking of Float Level has not changed. See Figure 2.

The procedure for checking Mixture Control Solenoid Plunger travel or, E4MC, E4ME, E2MC and E2ME models has not changed, and is outlined in Figure 3.

The new gauge replaced J-9789-130 or BT 7720 which should be discarded and should no longer be used.

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.