DIESEL FUEL PRESSURE REVISION

Models Affected: All Equipped with V-6 & V-8 Diesel Engines

The injection pump housing pressure information given on page 6C5-14 of the 1985 New Product Service Information Manual was in error. Please correct your manual as follows:

Start the engine and record housing pressure. It should be:

C Series, 20.68-34.47 kPa (3-5 PSI)

Except C Series, 41.37-55.16 kPa (6-8 PSI)

In addition update page 6C5-15 of your manual with the revised chart shown in this bulletin.

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.