K 3500 Truck 4WD V8-350 5.7L (1993)
Fuel Pump Control Unit: Description and Operation
Fuel Module (Located Above Blower Motor Assembly)
On heavy duty models, a fuel module will override the control module two second timer and the fuel pump will run for twenty seconds and then shut
OFF if the vehicle is not started. This circuit corrects a hot restart (vapor lock) during a high ambient temperature condition.
