ENG. WON'T STAY RUNNING MAY HAVE FUEL PRESS. LOSS

MODELS/YEARS 1987-89 EIGHTY-EIGHT AND TORONADO MODELS

Models Affected:

Some 1988 Eighty-Eight Models built after vehicle numbers JW358673 and J1826547 and some 1987 through early built 1989 Toronado Models equipped with a 3.8L or 3800 (VIN Codes 3 or C) Engine.

Eighty-Eight Models:

Some 1988 models were equipped with a turbine style fuel pump which required a strainer/filter with a very high filtration rate to prevent pump damage. This strainer/filter could become restricted and cause a fuel pressure loss when exposed to an excessive accumulation of dust, dirt, and water.

If it has been determined that an Eighty-Eight model built after the above listed VIN break point, has a fuel pressure loss condition, refer to the identification label codes on the sender harness to identify which style fuel pump is being used (See Figure 1).

Vehicles with a CPD, CPE or CPP fuel pump/sender assembly identification label code, should have the fuel pump and sender assembly replaced with the parts listed below.

NOTE: Both the fuel pump kit and fuel sender kit will need to be installed as a new assembly. Strainer/filter, fuel pumps and fuel senders are not interchangeable with different styles.

Part Description: Part Number: ---------------- ----------- Fuel Sending Unit Kit 25094732 Fuel Pump Kit 25116144

Vehicles with any fuel pump/sender assembly identification label code not listed above, should be further diagnosed using chart A-7 of section 6E3-A-30 of the appropriate 1988 Eighty-Eight/Ninety-Eight Service Manual.

WARRANTY INFORMATION:

Labor Operation Number: J5590 Labor Time: 1.2 Hours Trouble Code: 92

Toronado Models:

It is possible for some 1987 through 1989 models up to and including VIN KU308017, to experience the same fuel pressure loss condition, however; not for the same reason as the Eighty-Eight models. On the Toronado models, the return line directs fuel onto the strainer/filter (see figure 2). This can lead to an aeration of the fuel around the fuel strainer/filter and may result in a loss of pressure. This condition may occur predominantly at less than 1/4 tank of fuel. To eliminate this condition, install a fuel deflector between the fuel pump and fuel strainer/filter as shown in Figure 2.

NOTE: It is always necessary to install a new fuel strainer/filter when a fuel deflector is installed.

Parts are currently available through General Motors Service Parts Operations under the following part numbers:

Part Description: Part Number: ----------------- ------------ Fuel Deflector 25027515 Fuel Strainer/Filter 25055697

WARRANTY INFORMATION:

Labor Operation Number: T5190 Labor Time: 0.9 Hour Trouble Code: 92

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.