CAMPAIGN: FUEL SENDER SEAL DISPLACEMENT, INSPECT/REPAIR
Subject: FUEL SENDER TO TANK SEAL DISPLACEMENT
Models/Years: 1991 BRAVADA
CONDITION
General Motors has determined that certain 1991 Oldsmobile Bravada Sports Utility Vehicles fail to conform to the requirements of Federal Motor Vehicle Safety Standard (FMVSS) 301, "Fuel System Integrity". Some vehicles may have been shipped with the fuel tank sender seal out of position. In the event of a rollover accident, an out of position seal could allow fuel spillage in excess of the amount prescribed by FMVSS 301. If an ignition source was present, fuel leakage resulting from this mispositioned seal could result in a fire.
To correct this condition, dealers are to inspect involved vehicles to determine if the fuel sender/pump seal has become displaced and replace those seals that have become displaced.
VEHICLES INVOLVED
Certain 1991 Oldsmobile Bravada Sport Utility Vehicles within the following VIN breakpoints:
Through & Year Model Plant Beginning Including ---- ------- ------- -------- --------- 1991 Bravada Moraine M2700001 M2704042
NOTE: Except for a few Bravadas which Oldsmobile warranty records indicate had prior Fuel Sender Seal Ring replacement, all vehicles between the breakpoints will need inspection, and as necessary, replacement of the sender seal. It is estimated that less than 1 % of the sender seals will require replacement.
DEALER ACTION
Dealers are to perform this campaign on all vehicles involved at no charge to owners, regardless of mileage, age of vehicle, or ownership, from this time forward.
Whenever a vehicle subject to this campaign is taken into your new or used vehicle inventory, or it is in your dealership for service, dealers are to ensure the campaign correction has been made before selling or releasing the vehicle.
Dealers are to contact owners of vehicles recently sold from your new or used vehicle inventory and arrange for the campaign correction to be performed.
SERVICE PROCEDURE
PROCEDURE "A", INSPECTION:
CAUTION:
GASOLINE OR GASOLINE VAPORS ARE HIGHLY FLAMMABLE. IF AN IGNITION SOURCE IS PRESENT A FIRE COULD OCCUR. HAVE A DRY CHEMICAL (CLASS B) FIRE EXTINGUISHER NEARBY.
1. Write down the owner's preset memory settings which will be lost when the battery is disconnected for reference later when resetting the memory functions. If a memory retention device is plugged into the cigarette lighter socket (such as "Memor-Eze", Snap-On Tool YA960, or Kent-Moore Tools KS295A or BT 9027), this step can be omitted.
2. Raise and support the hood. Disconnect the negative battery cable.
3. Remove fuel tank filler cap to relieve any fuel vapor pressure, then reinstall the fuel tank filler cap and tighten until an audible 'click" is heard.
4. Disconnect the radiator pressure test cap from a Radiator Pressure Test Pump - Kent Moore J 24460-01, or equivalent.
5. Remove the fuel vapor canister purge hose from the canister fitting marked "TANK". Insert the threaded end of the Radiator Pressure Tester Hose into the fuel tank vapor purge hose.
6. Pressurize the fuel tank and emissions system with 30 strokes of the Radiator Pressure Tester Hand Pump. The pressure gage on the pump will indicate a low amount of pressure. Note the location of the needle in relationship to the gage and monitor for one minute. If the emissions system, fuel tank filler cap and fuel tank sender seal ring are correctly installed there should be no loss of pressure.
CAUTION:
DO NOT, UNDER ANY CIRCUMSTANCE, USE A SHOP AIR HOSE IN PLACE OF THE RADIATOR PRESSURE TESTER HAND PUMP. OVER PRESSURIZING OF THE FUEL TANK OR EMISSIONS SYSTEM COULD LEAD TO SYSTEM LEAKAGE OR DAMAGE. IF AN IGNITION SOURCE IS PRESENT, A FIRE COULD OCCUR.
7. After one minute, slowly remove the fuel tank cap while listening for pressure being released past the filler cap threads.
If release of pressure is evident, the seal ring has not been displaced. Go to step 8. Stop after completing step 10.
If no pressure is detected when the fuel tank filler cap is removed, it will be necessary to remove the fuel tank to replace the fuel tank sender seal ring. Perform step 8 (immediately following this step), then proceed to Service Procedure "B", Replacement of the Fuel Sender Seal Ring.
8. Disconnect the Radiator Pressure Tester Hand Pump hose from the fuel tank purge hose and reconnect the purge hose to the fuel vapor canister.
9. Reconnect the negative battery cable. If a memory retention device was not used, please reset (to the extent possible) all devices that lost their memory after the battery was disconnected.
10. Install a Campaign identification Label.
PROCEDURE "B", REPLACEMENT OF THE FUEL SENDER SEAL RING:
CAUTION:
GASOLINE OR GASOLINE VAPORS ARE HIGHLY FLAMMABLE. IF AN IGNITION SOURCE IS PRESENT A FIRE COULD OCCUR. HAVE A DRY CHEMICAL (CLASS B) FIRE EXTINGUISHER NEARBY.
1. Drain fuel from tank (see page 6E2-C2-19 of the 1991 Oldsmobile Bravada Service Manual).
CAUTION:
NEVER DRAIN OR STORE GASOLINE IN AN OPEN CONTAINER, DUE TO THE POSSIBILITY OF FIRE OR EXPLOSION.
2. Raise the vehicle on a hoist. Follow the "Vehicle Lifting Procedures" and "NOTICE" provided on page 0A- 10 of the 1991 Oldsmobile Bravada Service Manual.
3. Remove the fuel tank plastic shield and loosen the filler neck hose clamp at the fuel tank.
4. Support the fuel tank and remove the tank brackets. See Figure 1.
5. Lower the fuel tank and disconnect the filler neck from the tank. Disconnect the fuel/vapor hoses and the electrical connections at the sender.
6. Remove the fuel sender and seal ring using tool J 36608 (See Figure 2). Discard the old seal ring.
7. Install a new seal ring (P/N 3893116) and reinstall sender using tool J 36608.
8. Raise tank slightly and reconnect the fuel/vapor hoses and the electrical connections at the sender. Ensure the ground strap is also reinstalled to the body.
9. Raise the tank fully and reinstall the fuel tank filler neck to the tank. Tighten clamp.
10. Reinstall the fuel tank brackets with insulator strips in place. Tighten the bracket nuts to 45 N.m (33 lb. ft.).
11. Reinstall the fuel tank plastic shield. Reinstall fuel. Reinstall fuel tank filler cap.
12. Reconnect the negative battery cable. If a memory retention device was not used, please reset (to the extent possible) all devices that lost their memory after the battery was disconnected.
13. Install a Campaign Identification Label.
CAMPAIGN IDENTIFICATION LABEL
Each label provides space to print the campaign number, and the five (5) digit dealer code of the dealer performing the campaign. Insert this information with a typewriter or ballpoint pen. When installing label, clean and dry the surface of the radiator support tie bar and apply the campaign label where it is readily visible.
PARTS INFORMATION
To ensure parts are obtained as soon as possible, order them from GM Service Parts Operations (GMSPO) on a C.I.O. order, with NO special instruction code, but order on an Advise Code (2). Use the following part number:
Description Part Number Quantity Per Vehicle ----------------------------- ----------- ------------------ O-Ring, Fuel Sender (pkg of 10) 3893116 1, as required
NOTE: It is expected that less than 1 % of the Bravadas inspected will require a new fuel sender ring; please order parts accordingly. Remember, the seal comes in packages of ten.
WARRANTY CLAIM INFORMATION
Submit claims using only one of the labor-ops below for each vehicle:
REPAIR PERFORMED TOT-PTS FC LAB-OP LHRS ST ----------------------- ------- -- ------ ---- --- Pressurize Fuel System 96 V6780 .2 .1* - No Loss of Pressure
Pressurize Fuel System - 96 V6781 1.1 .1* Pressure Loss - Remove Fuel Tank And Install New Fuel Sender Seal Ring
* .1 hour for clerical administration may be applied for in the Straight Time (ST) column.
Parts allowance: Current dealer price, plus 30% allowance for handling.
NOTE: Bravadas that had the Fuel Sender Seal Ring previously replaced under warranty are not included in this campaign.
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.
