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Fuel system
High-pressure fuel pump control
The vapor separator contains 2 high-pressure fuel pumps: a main pump without a check valve and a
sub pump with a check valve. When the engine load is low, only the main pump operates, and when
the engine load is high, the sub pump also operates.
The high-pressure fuel pumps are controlled by the ECM using feedback based on information from
the fuel pressure sensor (high-pressure fuel pump). The drive force of the fuel pumps changes dynam-
ically and the fuel pumps may stop when the engine load is small. This prevents vapor gas from col-
lecting in the vapor separator and contributes to more efficient operation.
Low-pressure fuel pump control
When the engine load is low, the pump will cycle ON for 10 seconds and OFF for 20 seconds.
When the engine load is high, the pump is ON continuously.
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