Blazer 4WD V6-4.3L VIN X (2005)
Fuel Pressure: Testing and Inspection
Fuel System Diagnosis
FUEL SYSTEM DIAGNOSIS
SYSTEM DESCRIPTION
The control module enables the fuel pump relay when the ignition switch is turned ON. The control module will disable the fuel pump relay within 2
seconds unless the control module detects ignition reference pulses. The control module continues to enable the fuel pump relay as long as ignition
reference pulses are detected. The control module disables the fuel pump relay within 2 seconds if ignition reference pulses cease to be detected and
the ignition remains ON.
The fuel tank stores the fuel supply. The electric fuel pump supplies fuel through an inline fuel filter to the fuel injection system. The pump provides
fuel at a higher rate of flow than is needed by the fuel injection system. The fuel pressure regulator maintains the correct fuel pressure to the fuel
injection system. A separate pipe returns unused fuel to the fuel tank.
TEST
