Bang/Slosh from Rear of Vehicle (Install Fuel Tank Insulators)

Some customers may comment on a bang/slosh type noise coming from the rear of the vehicle. This noise will be most noticeable when the vehicle comes to a stop or during parking lot maneuvers. Customers may also comment that the noise will not occur when the fuel tank is full.

The noise may be caused by fuel in the fuel tank sloshing when the fuel level is below full. This noise is transferred through the rear seat and storage area due to hard contact between the fuel tank and the floorpan.

Install insulator pads (P/N 88895867) to the top of the fuel tank and to the fuel straps, using the following service procedure:

1. Remove the fuel tank. Refer to the Fuel Tank Replacement Procedure in the Engine Controls sub-section of the Service Manual.
2. Remove the old insulator pads from the top of the fuel tank and clean the insulator pad mounting surfaces with a suitable cleaner.

Important: Some of the fuel tanks and fuel tank straps may have a thinner insulator pad already located at one or more of the installation points. Remove the original pads to ensure proper adhesion of the new insulator pads.

3. Clean the fuel tank straps with a suitable cleaner.
4. Using a utility knife, cut the insulator pads (P/N 88895867) as follows:

•	Cut 5 pieces measuring 63.5 mm X 63.5 mm (2½ in X 2½ in) for use on the top of the fuel tank.

•	Cut 8 pieces measuring 38.1 mm X 63.5 mm (1½ in X 2½ in) for use on the fuel tank straps.

5. Install the insulator pads to the top of the fuel tank as shown in Figure 1.

Figure 1 -- Fuel Tank Insulators

Parts are currently available from GMSPO.

For vehicles repaired under warranty, use: