When diagnosing fuel pressure on the 1990 W-Car with the 2.5L (VIN R) engine application, use TBI pressure gauge modification kit Kent-Moore J 29658-100. The kit includes a 414 kPa (60 psi) gauge head and instructions to connect it to the TBI fuel pressure gauge J 29658-B. Normal operating fuel pressure for this engine is 179 to 220 kPa (26 to 32 psi). TBI pressure gauge J 29658-100 will be included in the 1990 model essential tool package.
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.