Ford Transit 2002 Owner's Manual page 867

The action of the fuel injectors opening and closing causes changes in pressure to the fuel
behind the fuel injector. The fuel rail acts as an accumulator, minimizing this affect.
The volume of fuel held by the fuel rail cannot be to large as this will cause a increase in
pressurization time and a corresponding increase in engine start time.
The four fuel injector high-pressure fuel lines attached to the fuel rail are of equal length.
This is to eliminate any variation in delivery pressure at the fuel injectors.
Fitted into the fuel rail is the fuel pressure sensor. The fuel pressure sensor monitors the
current fuel pressure available at the fuel injectors. The fuel pressure sensor is a non
serviceable component. Due to the tapered thread construction of the fuel rail union, a fuel
tight seal capable of withstanding the high fuel pressures cannot be guaranteed. So the fuel
rail and fuel pressure sensor must be renewed as one component
If the fuel pressure sensor does not see a minimum preset value during cranking, the PCM
will not allow the fuel injectors to inject and the engine will not start.
If the fuel pressure sensor signal to the PCM is lost or the value indicated does not match
the expected value for the given engine condition, the fuel metering valve will default to the
closed position and will not allow the development of the high-pressure fuel supply.
Fuel injector
Item Part Number
1 -
2 -
3 -
4 -
5 -
6 -
7 -
8 -
9 -
10 -
-
Description
Control chamber fuel inlet choke
Solenoid valve
Injection control valve spring
Injection control valve
Injection control valve fuel return bore
Injector needle upper control chamber fuel outlet choke
Injector needle upper chamber
Injector needle high-pressure fuel outlet
Injector needle
Injector needle lower chamber
http://vnx.su