EXTENDED CRANKING TIME DIAGNOSIS

EXTENDED CRANKING TIME (SLOW STARTING) ON 1982 ELECTRONIC FUEL INJECTION (EFI) SKYLARKS AND CENTURY MODELS COULD BE CAUSED BY THE FUEL PUMP CHECK VALVE ALLOWING THE FUEL TO RETURN TO THE FUEL TANK AFTER SHUT DOWN. IF THIS CONDITION IS REPORTED, THE CHECK VALVE CAN BE DIAGNOSED BY DISCONNECTING THE FUEL LINE AT THE FUEL FILTER (REFER TO 1982 CENTURY - SKYLARK SERVICE MANUAL, PAGE 6E2-55 FOR RELIEVING PRESSURE). CONNECT A RADIATOR TESTER PUMP TO THE LINE FROM THE TANK AND APPLY AIR PRESSURE. NOTE FUEL TANK FILLER CAP MUST BE REMOVED. IF 15 PSI PRESSURE CAN BE OBTAINED AND HELD FOR 60 SECONDS AFTER PUMPING, THE CHECK VALVE IS OPERATING. IF PRESSURE CANNOT BE HELD, REPLACE THE FUEL PUMP.

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.