Fuel Pressure Control Circuit

Circuit Description
The engine control module turns on a vacuum switching valve to draw the air into the diaphragm chamber of the pressure regulator if it detects that the temperature of the engine coolant is too high during engine starting.

The air drawn into the chamber increases the fuel pressure to prevent fuel vapor lock at high engine temperature in order to help the engine start when it is warm.

Fuel pressure control ends approx. 100 secs. after the engine is started.

Fuel Pressure VSV Diagnostic Chart:

Diagnostic Chart

Fuel Pressure VSV Circuit Diagram:

Circuit Diagram

Fuel Pressure VSV Inspection Procedure:

Fuel Pressure VSV Inspection Procedure Part 2:

Inspection Procedure