Rail; Outline - Denso 4D56 Service Manual

Operation Section
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5. RAIL

5.1 Outline

Stores pressurized fuel (25 to 180 MPa) that has been delivered from the supply pump and distributes the fuel to each cylinder injector.
A rail pressure sensor and a pressure limiter valve are adopted in the rail.
The rail pressure sensor (Pc sensor) detects fuel pressure in the rail and sends a signal to the engine ECU, and the pressure limiter
controls the excess pressure. This ensures optimum combustion and reduces combustion noise.
Pressure Sensor
Pressure Limiter
Q001236E