Ford Transit 2002 Owner's Manual page 846

Common rail
Item Part Number
1 -
2 -
3 -
4 -
The common rail is made of forged steel.
The common rail performs the following functions:
stores fuel under high pressure and
prevents pressure fluctuations.
Because of the operating movement in the high pressure chamber of the high pressure
pump and the opening and closing of the solenoid valves at the fuel injectors, pressure
fluctuations occur in the high pressure fuel system.
The common rail is constructed in such a way that it has a volume large enough to keep the
pressure fluctuations to a minimum.
For fast starting, the volume in the common rail is small enough to allow build up of the
required fuel pressure in the shortest possible time.
The fuel supplied by the high pressure pump passes through a high pressure line to the
high pressure reservoir. The fuel is supplied to each fuel injector by the four fuel injection
lines, all of which are the same length.
If fuel for one injection is taken from the common rail, the pressure in the common rail
remains almost constant.
The pressure sensor in the common rail informs the PCM of the current fuel pressure in the
common rail.
High pressure fuel pipes
Item Part Number
1 -
Description
Common rail
Fuel pressure sensor
Line connections to the high pressure pump
Line connections to the fuel injectors
Description
High-pressure fuel lines between the fuel distribution pipe (common
rail) and the injectors
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