Denso CRS - Rail Description; Rail Functions and Composition

Operation Section
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4. RAIL DESCCRIPTION
4.1 Rail Functions and Composition
z The function of the rail is to distribute fuel pressurized by the supply pump to each cylinder injector.
z The shape of the rail depends on the model and the component parts vary accordingly.
z The component parts are the rail pressure sensor (Pc sensor), pressure limiter, and for some models a flow damper and
pressure discharge valve.
4.2 Component Part Construction and Operation
Component Parts Functions
Rail Stores pressurized fuel that has been pumped from the supply pump and distrib-
utes the fuel to each cylinder injector.
Pressure Limiter Opens the valve to release pressure if the pressure in the rail becomes abnormally
high.
Rail Pressure Sensor (Pc Sensor) Detects the fuel pressure in the rail.
Flow Damper Reduces the pressure pulsations of fuel in the rail. If fuel flows out excessively, the
damper closes the fuel passage to prevent further flow of fuel. Mostly used with
engines for large vehicles.
Pressure Discharge Valve Controls the fuel pressure in the rail. Mostly used with engines for passenger cars.
Rail
Rail
Pressure Limiter
Pressure Limiter
Rail Pressure Sensor (Pc Sensor)
Rail Pressure Sensor (Pc Sensor)
Flow Damper
Pressure Discharge Valve
Q000854E