System Description

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

Low fuel pressure control 

• The low fuel pressure pump is controlled by ECM and pumps fuel according to a driving condition. The pumped fuel passes through the fuel filter and is sent to the high pressure fuel pump.
• Low fuel pressure is adjusted by the fuel pressure regulator.

High fuel pressure control 

• The high pressure fuel pump is actuated by the cam of camshaft (EXH).
• The high pressure fuel pump activates the high pressure fuel pump solenoid based on a signal received from ECM, and adjusts the amount of discharge by changing the timing of closing the inlet checkvalve to control fuel rail pressure.

For details about operation, Refer to HIGH PRESSURE FUEL PUMP .