Fuel - Pressure Loss, Restricted Pump Strainer/Filter
90oldsmobile06SUBJECT ENGINE THAT WILL NOT STAY RUNNING MAY HAVE
FUEL PRESSURE LOSS (NEW PART) WITH 3.8L OR 3800 (ENGINE VIN CODES 3 OR C)
MODELS/YEARS 1987-89 EIGHTY-EIGHT AND TORONADO MODELS
NUMBER: 89-T-157
CORP. REF. NO: 906504R
DATE: April 1990
SECTION: 6C
Models Affected:
Some 1988 Eighty-Eight Models built after vehicle numbers JW358673 and JI826547 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.
Figure 1:
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 identity 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 dffferent 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
Figure 2:
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