T100 Pickup 4WD V6-180.5 2959cc 3.0L SOHC (3VZ-E) (1993)
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Fuel Pressure Vacuum Switching Valve: Description and Operation
PURPOSE
The Fuel Pressure Vacuum Switching Valve (VSV) is used to raise fuel pressure during hot restart conditions.
OPERATION
During a hot restart, the Engine Control Module (ECM) energizes the VSV which redirects the vacuum supply for the Fuel Pressure Regulator to
the atmosphere. When the vacuum is vented, the Fuel Pressure Regulator raises fuel pressure accordingly.