S10/T10 Blazer 4WD V6-262 4.3L VIN W CPI (1992)
Fuel Pump Relay: Description and Operation
OPERATION
When the ignition key is first turned to the "ON" position, the control module will energize the fuel pump relay as long as the engine is cranking or
running, and the control module is receiving distributor reference pulses. If there are no reference pulses, the control module will shut "OFF" the fuel
pump relay within two seconds.
An inoperative fuel pump relay can result in extended crank times, particularily if the engine is cold. The oil pressure switch will turn "ON" the fuel
pump, as soon as oil pressure reaches about 28 kPa (4 psi).
